815894394 has 48 divisors (see below), whose sum is σ = 1959457536. Its totient is φ = 225590400.

The previous prime is 815894393. The next prime is 815894411. The reversal of 815894394 is 493498518.

815894394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (815894393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35647 + ... + 53874.

It is an arithmetic number, because the mean of its divisors is an integer number (40822032).

Almost surely, 2^815894394 is an apocalyptic number.

815894394 is an abundant number, since it is smaller than the sum of its proper divisors (1143563142).

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

815894394 is a wasteful number, since it uses less digits than its factorization.

815894394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89571 (or 89564 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 51.

The square root of 815894394 is about 28563.8651796286. The cubic root of 815894394 is about 934.4254313544.

The spelling of 815894394 in words is "eight hundred fifteen million, eight hundred ninety-four thousand, three hundred ninety-four".