813902 has 4 divisors (see below), whose sum is σ = 1220856. Its totient is φ = 406950.

The previous prime is 813893. The next prime is 813907. The reversal of 813902 is 209318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209318 = 2 ⋅104659.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 813902.

It is not an unprimeable number, because it can be changed into a prime (813907) by changing a digit.

813902 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 203474 + ... + 203477.

It is an arithmetic number, because the mean of its divisors is an integer number (305214).

2⁸¹³⁹⁰² is an apocalyptic number.

813902 is a deficient number, since it is larger than the sum of its proper divisors (406954).

813902 is a wasteful number, since it uses less digits than its factorization.

813902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406953.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 813902 is about 902.1651733469. The cubic root of 813902 is about 93.3664196755.

The spelling of 813902 in words is "eight hundred thirteen thousand, nine hundred two".