| Base | Representation |
|---|---|
| bin | 11001101011101… |
| … | …01101101110000 |
| 3 | 120000101111110011 |
| 4 | 30311311231300 |
| 5 | 420123041430 |
| 6 | 33213344304 |
| 7 | 5224132441 |
| oct | 1465655560 |
| 9 | 500344404 |
| 10 | 215440240 |
| 11 | 100679494 |
| 12 | 60198094 |
| 13 | 35832142 |
| 14 | 208812c8 |
| 15 | 13da922a |
| hex | cd75b70 |
215440240 has 80 divisors (see below), whose sum is σ = 540277920. Its totient is φ = 79626240.
The previous prime is 215440231. The next prime is 215440249. The reversal of 215440240 is 42044512.
It is a happy number.
It is an interprime number because it is at equal distance from previous prime (215440231) and next prime (215440249).
It is a tau number, because it is divible by the number of its divisors (80).
It is a super-2 number, since 2×2154402402 = 92828994022515200, which contains 22 as substring.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (215440249) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60592 + ... + 64048.
It is an arithmetic number, because the mean of its divisors is an integer number (6753474).
Almost surely, 2215440240 is an apocalyptic number.
215440240 is a gapful number since it is divisible by the number (20) 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 215440240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270138960).
215440240 is an abundant number, since it is smaller than the sum of its proper divisors (324837680).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
215440240 is a wasteful number, since it uses less digits than its factorization.
215440240 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3530 (or 3524 counting only the distinct ones).
The product of its (nonzero) digits is 1280, while the sum is 22.
The square root of 215440240 is about 14677.8826810954. The cubic root of 215440240 is about 599.4812553396.
Adding to 215440240 its reverse (42044512), we get a palindrome (257484752).
The spelling of 215440240 in words is "two hundred fifteen million, four hundred forty thousand, two hundred forty".
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