656939 has 2 divisors, whose sum is σ = 656940. Its totient is φ = 656938.

The previous prime is 656923. The next prime is 656951. The reversal of 656939 is 939656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656939 - 2⁴ = 656923 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328469 + 328470.

It is an arithmetic number, because the mean of its divisors is an integer number (328470).

2⁶⁵⁶⁹³⁹ is an apocalyptic number.

656939 is a deficient number, since it is larger than the sum of its proper divisors (1).

656939 is an equidigital number, since it uses as much as digits as its factorization.

656939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 38.

The square root of 656939 is about 810.5177357714. The cubic root of 656939 is about 86.9310679594.

The spelling of 656939 in words is "six hundred fifty-six thousand, nine hundred thirty-nine".