23999904 has 72 divisors (see below), whose sum is σ = 68796000. Its totient is φ = 7936128.

The previous prime is 23999897. The next prime is 23999909. The reversal of 23999904 is 40999932.

It is a tau number, because it is divible by the number of its divisors (72).

It is a self number, because there is not a number n which added to its sum of digits gives 23999904.

It is not an unprimeable number, because it can be changed into a prime (23999909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47847 + ... + 48345.

It is an arithmetic number, because the mean of its divisors is an integer number (955500).

Almost surely, 2^23999904 is an apocalyptic number.

23999904 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 23999904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34398000).

23999904 is an abundant number, since it is smaller than the sum of its proper divisors (44796096).

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

23999904 is a wasteful number, since it uses less digits than its factorization.

23999904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 23999904 is about 4898.9696875976. The cubic root of 23999904 is about 288.4495294611.

The spelling of 23999904 in words is "twenty-three million, nine hundred ninety-nine thousand, nine hundred four".