813925 has 12 divisors (see below), whose sum is σ = 1153696. Its totient is φ = 558000.

The previous prime is 813907. The next prime is 813931. The reversal of 813925 is 529318.

It is not a de Polignac number, because 813925 - 2⁵ = 813893 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 813893 and 813902.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2151 + ... + 2500.

2⁸¹³⁹²⁵ is an apocalyptic number.

It is an amenable number.

813925 is a deficient number, since it is larger than the sum of its proper divisors (339771).

813925 is a wasteful number, since it uses less digits than its factorization.

813925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668 (or 4663 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 813925 is about 902.1779203683. The cubic root of 813925 is about 93.3672991456.

The spelling of 813925 in words is "eight hundred thirteen thousand, nine hundred twenty-five".