| Base | Representation |
|---|---|
| bin | 100100010111010… |
| … | …1111001101010100 |
| 3 | 10011001001011120000 |
| 4 | 1020232233031110 |
| 5 | 4444333232130 |
| 6 | 321025211300 |
| 7 | 42144425022 |
| oct | 11056571524 |
| 9 | 3131034500 |
| 10 | 1220211540 |
| 11 | 576860a99 |
| 12 | 2a0790b30 |
| 13 | 165a4cc82 |
| 14 | b80b1712 |
| 15 | 721ce260 |
| hex | 48baf354 |
1220211540 has 240 divisors, whose sum is σ = 4171305600. Its totient is φ = 297416448.
The previous prime is 1220211539. The next prime is 1220211541. The reversal of 1220211540 is 451120221.
1220211540 is a `hidden beast` number, since 122 + 0 + 2 + 1 + 1 + 540 = 666.
1220211540 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is an interprime number because it is at equal distance from previous prime (1220211539) and next prime (1220211541).
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1220211541) by changing a digit.
It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 891937 + ... + 893303.
It is an arithmetic number, because the mean of its divisors is an integer number (17380440).
Almost surely, 21220211540 is an apocalyptic number.
1220211540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1220211540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2085652800).
1220211540 is an abundant number, since it is smaller than the sum of its proper divisors (2951094060).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1220211540 is a wasteful number, since it uses less digits than its factorization.
1220211540 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1436 (or 1425 counting only the distinct ones).
The product of its (nonzero) digits is 160, while the sum is 18.
The square root of 1220211540 is about 34931.5264481814. The cubic root of 1220211540 is about 1068.5914852625.
Adding to 1220211540 its reverse (451120221), we get a palindrome (1671331761).
The spelling of 1220211540 in words is "one billion, two hundred twenty million, two hundred eleven thousand, five hundred forty".
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