815403972 has 12 divisors (see below), whose sum is σ = 1902609296. Its totient is φ = 271801320.

The previous prime is 815403971. The next prime is 815403977. The reversal of 815403972 is 279304518.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 815403972.

It is not an unprimeable number, because it can be changed into a prime (815403971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33975154 + ... + 33975177.

Almost surely, 2^815403972 is an apocalyptic number.

It is an amenable number.

815403972 is an abundant number, since it is smaller than the sum of its proper divisors (1087205324).

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

815403972 is a wasteful number, since it uses less digits than its factorization.

815403972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67950338 (or 67950336 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 815403972 is about 28555.2792316937. The cubic root of 815403972 is about 934.2381707476.

The spelling of 815403972 in words is "eight hundred fifteen million, four hundred three thousand, nine hundred seventy-two".