656239 has 4 divisors (see below), whose sum is σ = 677440. Its totient is φ = 635040.

The previous prime is 656237. The next prime is 656263. The reversal of 656239 is 932656.

656239 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 656239 - 2¹ = 656237 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 21169 = 656239 / (6 + 5 + 6 + 2 + 3 + 9).

It is a d-powerful number, because it can be written as 6 + 5⁷ + 2 + 6⁶ + 3¹² + 9 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656237) 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, 10554 + ... + 10615.

It is an arithmetic number, because the mean of its divisors is an integer number (169360).

2⁶⁵⁶²³⁹ is an apocalyptic number.

656239 is a deficient number, since it is larger than the sum of its proper divisors (21201).

656239 is a wasteful number, since it uses less digits than its factorization.

656239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21200.

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

The square root of 656239 is about 810.0857979251. The cubic root of 656239 is about 86.9001805792.

The spelling of 656239 in words is "six hundred fifty-six thousand, two hundred thirty-nine".