813975 has 12 divisors (see below), whose sum is σ = 1345896. Its totient is φ = 434080.

The previous prime is 813971. The next prime is 813991. The reversal of 813975 is 579318.

It is not a de Polignac number, because 813975 - 2² = 813971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5352 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (112158).

2⁸¹³⁹⁷⁵ is an apocalyptic number.

813975 is a deficient number, since it is larger than the sum of its proper divisors (531921).

813975 is a wasteful number, since it uses less digits than its factorization.

813975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866 (or 10861 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 813975 is about 902.2056306630. The cubic root of 813975 is about 93.3692109800.

The spelling of 813975 in words is "eight hundred thirteen thousand, nine hundred seventy-five".