23439864 has 96 divisors (see below), whose sum is σ = 69471360. Its totient is φ = 6455040.

The previous prime is 23439847. The next prime is 23439893. The reversal of 23439864 is 46893432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282367 + ... + 282449.

It is an arithmetic number, because the mean of its divisors is an integer number (723660).

Almost surely, 2^23439864 is an apocalyptic number.

23439864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23439864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34735680).

23439864 is an abundant number, since it is smaller than the sum of its proper divisors (46031496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23439864 is a wasteful number, since it uses less digits than its factorization.

23439864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 136 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 23439864 is about 4841.4733294732. The cubic root of 23439864 is about 286.1881820196.

The spelling of 23439864 in words is "twenty-three million, four hundred thirty-nine thousand, eight hundred sixty-four".