252635440 has 40 divisors (see below), whose sum is σ = 601711488. Its totient is φ = 98588160.

The previous prime is 252635423. The next prime is 252635447. The reversal of 252635440 is 44536252.

252635440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (252635447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35232 + ... + 41791.

Almost surely, 2^252635440 is an apocalyptic number.

252635440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

252635440 is an abundant number, since it is smaller than the sum of its proper divisors (349076048).

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

252635440 is a wasteful number, since it uses less digits than its factorization.

252635440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77077 (or 77071 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 252635440 is about 15894.5097439336. The cubic root of 252635440 is about 632.1664225509.

It can be divided in two parts, 25263 and 5440, that added together give a palindrome (30703).

The spelling of 252635440 in words is "two hundred fifty-two million, six hundred thirty-five thousand, four hundred forty".