23921900 has 36 divisors (see below), whose sum is σ = 52314360. Its totient is φ = 9494400.

The previous prime is 23921899. The next prime is 23921917. The reversal of 23921900 is 912932.

It is a super-2 number, since 2×23921900² = 1144514599220000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23921900.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13040 + ... + 14760.

Almost surely, 2^23921900 is an apocalyptic number.

23921900 is a gapful number since it is divisible by the number (20) 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 23921900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26157180).

23921900 is an abundant number, since it is smaller than the sum of its proper divisors (28392460).

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

23921900 is a wasteful number, since it uses less digits than its factorization.

23921900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874 (or 1867 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 23921900 is about 4891.0019423427. The cubic root of 23921900 is about 288.1366860182.

The spelling of 23921900 in words is "twenty-three million, nine hundred twenty-one thousand, nine hundred".