23999990 has 32 divisors (see below), whose sum is σ = 50310720. Its totient is φ = 8072064.

The previous prime is 23999981. The next prime is 23999999. The reversal of 23999990 is 9999932.

It is an interprime number because it is at equal distance from previous prime (23999981) and next prime (23999999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23999999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (1572210).

Almost surely, 2^23999990 is an apocalyptic number.

23999990 is an abundant number, since it is smaller than the sum of its proper divisors (26310730).

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

23999990 is a wasteful number, since it uses less digits than its factorization.

23999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6536.

The product of its (nonzero) digits is 354294, while the sum is 50.

The square root of 23999990 is about 4898.9784649455. The cubic root of 23999990 is about 288.4498739990.

The spelling of 23999990 in words is "twenty-three million, nine hundred ninety-nine thousand, nine hundred ninety".