811902 has 32 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 213984.

The previous prime is 811897. The next prime is 811919. The reversal of 811902 is 209118.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

811902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198 + ... + 1289.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2⁸¹¹⁹⁰² is an apocalyptic number.

811902 is an abundant number, since it is smaller than the sum of its proper divisors (1187970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

811902 is a wasteful number, since it uses less digits than its factorization.

811902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 811902 is about 901.0560470914. The cubic root of 811902 is about 93.2898805667.

The spelling of 811902 in words is "eight hundred eleven thousand, nine hundred two".