265221240 has 64 divisors (see below), whose sum is σ = 823111200. Its totient is φ = 68285952.

The previous prime is 265221197. The next prime is 265221317. The reversal of 265221240 is 42122562.

It is a happy number.

It is a super-2 number, since 2×265221240² = 140684612294275200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 265221240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34627 + ... + 41586.

Almost surely, 2^265221240 is an apocalyptic number.

265221240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265221240 is an abundant number, since it is smaller than the sum of its proper divisors (557889960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265221240 is a wasteful number, since it uses less digits than its factorization.

265221240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76256 (or 76252 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 265221240 is about 16285.6145109726. The cubic root of 265221240 is about 642.4945287628.

The spelling of 265221240 in words is "two hundred sixty-five million, two hundred twenty-one thousand, two hundred forty".