815056394 has 16 divisors (see below), whose sum is σ = 1237255656. Its totient is φ = 402667200.

The previous prime is 815056391. The next prime is 815056477. The reversal of 815056394 is 493650518.

It can be written as a sum of positive squares in 4 ways, for example, as 125731369 + 689325025 = 11213^2 + 26255^2 .

It is not an unprimeable number, because it can be changed into a prime (815056391) 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, 49664 + ... + 64004.

Almost surely, 2^815056394 is an apocalyptic number.

815056394 is a deficient number, since it is larger than the sum of its proper divisors (422199262).

815056394 is a wasteful number, since it uses less digits than its factorization.

815056394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14681.

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 815056394 is about 28549.1925279858. The cubic root of 815056394 is about 934.1054076037.

The spelling of 815056394 in words is "eight hundred fifteen million, fifty-six thousand, three hundred ninety-four".