811906 has 16 divisors (see below), whose sum is σ = 1268064. Its totient is φ = 389664.

The previous prime is 811897. The next prime is 811919. The reversal of 811906 is 609118.

It is an unprimeable number.

811906 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 7 ways as a sum of consecutive naturals, for example, 9741 + ... + 9823.

It is an arithmetic number, because the mean of its divisors is an integer number (79254).

2⁸¹¹⁹⁰⁶ is an apocalyptic number.

811906 is a deficient number, since it is larger than the sum of its proper divisors (456158).

811906 is a wasteful number, since it uses less digits than its factorization.

811906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 811906 is about 901.0582667064. The cubic root of 811906 is about 93.2900337703.

The spelling of 811906 in words is "eight hundred eleven thousand, nine hundred six".