923639 has 4 divisors (see below), whose sum is σ = 936720. Its totient is φ = 910560.

The previous prime is 923617. The next prime is 923641. The reversal of 923639 is 936329.

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 923639 - 2¹⁶ = 858103 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 923639.

It is not an unprimeable number, because it can be changed into a prime (923239) 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, 6434 + ... + 6575.

It is an arithmetic number, because the mean of its divisors is an integer number (234180).

2⁹²³⁶³⁹ is an apocalyptic number.

923639 is a deficient number, since it is larger than the sum of its proper divisors (13081).

923639 is a wasteful number, since it uses less digits than its factorization.

923639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13080.

The product of its digits is 8748, while the sum is 32.

The square root of 923639 is about 961.0613924199. The cubic root of 923639 is about 97.3869476415.

The spelling of 923639 in words is "nine hundred twenty-three thousand, six hundred thirty-nine".