23921940 has 48 divisors (see below), whose sum is σ = 76551552. Its totient is φ = 5467776.

The previous prime is 23921939. The next prime is 23921971. The reversal of 23921940 is 4912932.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 23921898 and 23921907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28059 + ... + 28898.

It is an arithmetic number, because the mean of its divisors is an integer number (1594824).

Almost surely, 2^23921940 is an apocalyptic number.

23921940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23921940 is an abundant number, since it is smaller than the sum of its proper divisors (52629612).

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

23921940 is a wasteful number, since it uses less digits than its factorization.

23921940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56976 (or 56974 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 23921940 is about 4891.0060314827. The cubic root of 23921940 is about 288.1368466166.

The spelling of 23921940 in words is "twenty-three million, nine hundred twenty-one thousand, nine hundred forty".