956639 has 4 divisors (see below), whose sum is σ = 998256. Its totient is φ = 915024.

The previous prime is 956633. The next prime is 956689. The reversal of 956639 is 936659.

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 956639 - 2⁸ = 956383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 956639.

It is not an unprimeable number, because it can be changed into a prime (956633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20774 + ... + 20819.

It is an arithmetic number, because the mean of its divisors is an integer number (249564).

2⁹⁵⁶⁶³⁹ is an apocalyptic number.

956639 is a deficient number, since it is larger than the sum of its proper divisors (41617).

956639 is a wasteful number, since it uses less digits than its factorization.

956639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41616.

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

The square root of 956639 is about 978.0792401437. The cubic root of 956639 is about 98.5332242101.

The spelling of 956639 in words is "nine hundred fifty-six thousand, six hundred thirty-nine".