252640905 has 16 divisors (see below), whose sum is σ = 440973504. Its totient is φ = 122492480.

The previous prime is 252640889. The next prime is 252640907. The reversal of 252640905 is 509046252.

It is not a de Polignac number, because 252640905 - 2⁴ = 252640889 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (252640907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 765414 + ... + 765743.

It is an arithmetic number, because the mean of its divisors is an integer number (27560844).

Almost surely, 2^252640905 is an apocalyptic number.

It is an amenable number.

252640905 is a deficient number, since it is larger than the sum of its proper divisors (188332599).

252640905 is a wasteful number, since it uses less digits than its factorization.

252640905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1531176.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 252640905 is about 15894.6816577118. The cubic root of 252640905 is about 632.1709808512.

The spelling of 252640905 in words is "two hundred fifty-two million, six hundred forty thousand, nine hundred five".