815405252 has 24 divisors (see below), whose sum is σ = 1454241600. Its totient is φ = 399937376.

The previous prime is 815405207. The next prime is 815405257. The reversal of 815405252 is 252504518.

It is not an unprimeable number, because it can be changed into a prime (815405257) 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 7 ways as a sum of consecutive naturals, for example, 115274 + ... + 122142.

It is an arithmetic number, because the mean of its divisors is an integer number (60593400).

Almost surely, 2^815405252 is an apocalyptic number.

It is an amenable number.

815405252 is a deficient number, since it is larger than the sum of its proper divisors (638836348).

815405252 is a wasteful number, since it uses less digits than its factorization.

815405252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7435 (or 7433 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 32.

The square root of 815405252 is about 28555.3016443532. The cubic root of 815405252 is about 934.2386595950.

The spelling of 815405252 in words is "eight hundred fifteen million, four hundred five thousand, two hundred fifty-two".