| Base | Representation |
|---|---|
| bin | 100100001110011… |
| … | …1001000110000000 |
| 3 | 10010201020111102001 |
| 4 | 1020130321012000 |
| 5 | 4442134032230 |
| 6 | 320341033344 |
| 7 | 42056602162 |
| oct | 11034710600 |
| 9 | 3121214361 |
| 10 | 1215533440 |
| 11 | 5741562a0 |
| 12 | 29b0b5854 |
| 13 | 164aa2874 |
| 14 | b7614932 |
| 15 | 71aa80ca |
| hex | 48739180 |
1215533440 has 128 divisors (see below), whose sum is σ = 3308325120. Its totient is φ = 422737920.
The previous prime is 1215533413. The next prime is 1215533441. The reversal of 1215533440 is 443355121.
It is a tau number, because it is divible by the number of its divisors (128).
It is a junction number, because it is equal to n+sod(n) for n = 1215533399 and 1215533408.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1215533441) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158167 + ... + 165673.
It is an arithmetic number, because the mean of its divisors is an integer number (25846290).
Almost surely, 21215533440 is an apocalyptic number.
1215533440 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 1215533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654162560).
1215533440 is an abundant number, since it is smaller than the sum of its proper divisors (2092791680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1215533440 is a wasteful number, since it uses less digits than its factorization.
1215533440 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 7560 (or 7548 counting only the distinct ones).
The product of its (nonzero) digits is 7200, while the sum is 28.
The square root of 1215533440 is about 34864.5011437135. The cubic root of 1215533440 is about 1067.2241322155.
Adding to 1215533440 its reverse (443355121), we get a palindrome (1658888561).
The spelling of 1215533440 in words is "one billion, two hundred fifteen million, five hundred thirty-three thousand, four hundred forty".
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