23439990 has 96 divisors (see below), whose sum is σ = 67527936. Its totient is φ = 5100480.

The previous prime is 23439919. The next prime is 23440003. The reversal of 23439990 is 9993432.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 110985 + ... + 111195.

It is an arithmetic number, because the mean of its divisors is an integer number (703416).

Almost surely, 2^23439990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23439990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33763968).

23439990 is an abundant number, since it is smaller than the sum of its proper divisors (44087946).

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

23439990 is a wasteful number, since it uses less digits than its factorization.

23439990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 39.

The square root of 23439990 is about 4841.4863420235. The cubic root of 23439990 is about 286.1886948162.

The spelling of 23439990 in words is "twenty-three million, four hundred thirty-nine thousand, nine hundred ninety".