656423 has 2 divisors, whose sum is σ = 656424. Its totient is φ = 656422.

The previous prime is 656407. The next prime is 656429. The reversal of 656423 is 324656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 656423 - 2⁴ = 656407 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 656392 and 656401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328211 + 328212.

It is an arithmetic number, because the mean of its divisors is an integer number (328212).

2⁶⁵⁶⁴²³ is an apocalyptic number.

656423 is a deficient number, since it is larger than the sum of its proper divisors (1).

656423 is an equidigital number, since it uses as much as digits as its factorization.

656423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 26.

The square root of 656423 is about 810.1993581829. The cubic root of 656423 is about 86.9083016749.

The spelling of 656423 in words is "six hundred fifty-six thousand, four hundred twenty-three".