813609394 has 16 divisors (see below), whose sum is σ = 1315607832. Its totient is φ = 375136128.

The previous prime is 813609389. The next prime is 813609403. The reversal of 813609394 is 493906318.

It can be written as a sum of positive squares in 4 ways, for example, as 728730025 + 84879369 = 26995^2 + 9213^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 813609394.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11712 + ... + 42004.

Almost surely, 2^813609394 is an apocalyptic number.

813609394 is a deficient number, since it is larger than the sum of its proper divisors (501998438).

813609394 is a wasteful number, since it uses less digits than its factorization.

813609394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31341.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 813609394 is about 28523.8390473653. The cubic root of 813609394 is about 933.5522961040.

The spelling of 813609394 in words is "eight hundred thirteen million, six hundred nine thousand, three hundred ninety-four".