23639 has 8 divisors (see below), whose sum is σ = 29568. Its totient is φ = 18360.

The previous prime is 23633. The next prime is 23663. The reversal of 23639 is 93632.

23639 = 23² + 24² + ... + 43².

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 23639 - 2⁴ = 23623 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77 + ... + 230.

It is an arithmetic number, because the mean of its divisors is an integer number (3696).

2²³⁶³⁹ is an apocalyptic number.

23639 is a deficient number, since it is larger than the sum of its proper divisors (5929).

23639 is a wasteful number, since it uses less digits than its factorization.

23639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its digits is 972, while the sum is 23.

The square root of 23639 is about 153.7497967478. The cubic root of 23639 is about 28.6996345666.

The spelling of 23639 in words is "twenty-three thousand, six hundred thirty-nine".