656342439 has 4 divisors (see below), whose sum is σ = 875123256. Its totient is φ = 437561624.

The previous prime is 656342437. The next prime is 656342461. The reversal of 656342439 is 934243656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 656342439 - 2¹ = 656342437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656342439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656342437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109390404 + ... + 109390409.

It is an arithmetic number, because the mean of its divisors is an integer number (218780814).

Almost surely, 2^656342439 is an apocalyptic number.

656342439 is a deficient number, since it is larger than the sum of its proper divisors (218780817).

656342439 is a wasteful number, since it uses less digits than its factorization.

656342439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218780816.

The product of its digits is 466560, while the sum is 42.

The square root of 656342439 is about 25619.1810759048. The cubic root of 656342439 is about 869.0474618999.

The spelling of 656342439 in words is "six hundred fifty-six million, three hundred forty-two thousand, four hundred thirty-nine".