813928 has 8 divisors (see below), whose sum is σ = 1526130. Its totient is φ = 406960.

The previous prime is 813907. The next prime is 813931. The reversal of 813928 is 829318.

813928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 813604 + 324 = 902^2 + 18^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 813928.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50863 + ... + 50878.

2⁸¹³⁹²⁸ is an apocalyptic number.

It is an amenable number.

813928 is a deficient number, since it is larger than the sum of its proper divisors (712202).

813928 is a wasteful number, since it uses less digits than its factorization.

813928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101747 (or 101743 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 813928 is about 902.1795830099. The cubic root of 813928 is about 93.3674138579.

The spelling of 813928 in words is "eight hundred thirteen thousand, nine hundred twenty-eight".