23439 has 8 divisors (see below), whose sum is σ = 33712. Its totient is φ = 14400.

The previous prime is 23431. The next prime is 23447. The reversal of 23439 is 93432.

It is an interprime number because it is at equal distance from previous prime (23431) and next prime (23447).

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

It is not a de Polignac number, because 23439 - 2³ = 23431 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2³ + 3⁵ + 4⁷ + 3⁵ + 9⁴ .

It is a Duffinian number.

It is a plaindrome in base 5 and base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23431) 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, 262 + ... + 339.

It is an arithmetic number, because the mean of its divisors is an integer number (4214).

2²³⁴³⁹ is an apocalyptic number.

23439 is a deficient number, since it is larger than the sum of its proper divisors (10273).

23439 is a wasteful number, since it uses less digits than its factorization.

23439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617.

The product of its digits is 648, while the sum is 21.

The square root of 23439 is about 153.0980078251. The cubic root of 23439 is about 28.6184665651.

Subtracting from 23439 its product of digits (648), we obtain a triangular number (22791 = T₂₁₃).

The spelling of 23439 in words is "twenty-three thousand, four hundred thirty-nine".