656906 has 16 divisors (see below), whose sum is σ = 1058400. Its totient is φ = 304848.

The previous prime is 656891. The next prime is 656917. The reversal of 656906 is 609656.

656906 is nontrivially palindromic in base 16.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

656906 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, 2096 + ... + 2388.

It is an arithmetic number, because the mean of its divisors is an integer number (66150).

2⁶⁵⁶⁹⁰⁶ is an apocalyptic number.

656906 is a deficient number, since it is larger than the sum of its proper divisors (401494).

656906 is a wasteful number, since it uses less digits than its factorization.

656906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 656906 is about 810.4973781574. The cubic root of 656906 is about 86.9296123329.

The spelling of 656906 in words is "six hundred fifty-six thousand, nine hundred six".