656320439 has 8 divisors (see below), whose sum is σ = 691295280. Its totient is φ = 621388800.

The previous prime is 656320421. The next prime is 656320451. The reversal of 656320439 is 934023656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656320439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656320459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23159 + ... + 42999.

It is an arithmetic number, because the mean of its divisors is an integer number (86411910).

Almost surely, 2^656320439 is an apocalyptic number.

656320439 is a deficient number, since it is larger than the sum of its proper divisors (34974841).

656320439 is a wasteful number, since it uses less digits than its factorization.

656320439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21601.

The product of its (nonzero) digits is 116640, while the sum is 38.

The square root of 656320439 is about 25618.7517065137. The cubic root of 656320439 is about 869.0377518986.

The spelling of 656320439 in words is "six hundred fifty-six million, three hundred twenty thousand, four hundred thirty-nine".