656923 has 2 divisors, whose sum is σ = 656924. Its totient is φ = 656922.

The previous prime is 656917. The next prime is 656939. The reversal of 656923 is 329656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656923 - 2⁵ = 656891 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

656923 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (656993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328461 + 328462.

It is an arithmetic number, because the mean of its divisors is an integer number (328462).

2⁶⁵⁶⁹²³ is an apocalyptic number.

656923 is a deficient number, since it is larger than the sum of its proper divisors (1).

656923 is an equidigital number, since it uses as much as digits as its factorization.

656923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 31.

The square root of 656923 is about 810.5078654769. The cubic root of 656923 is about 86.9303622072.

The spelling of 656923 in words is "six hundred fifty-six thousand, nine hundred twenty-three".