23729440 has 48 divisors (see below), whose sum is σ = 64072512. Its totient is φ = 8135424.

The previous prime is 23729417. The next prime is 23729441. The reversal of 23729440 is 4492732.

It is not an unprimeable number, because it can be changed into a prime (23729441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9474 + ... + 11713.

It is an arithmetic number, because the mean of its divisors is an integer number (1334844).

Almost surely, 2^23729440 is an apocalyptic number.

23729440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23729440 is an abundant number, since it is smaller than the sum of its proper divisors (40343072).

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

23729440 is a wasteful number, since it uses less digits than its factorization.

23729440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21209 (or 21201 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 23729440 is about 4871.2873041938. The cubic root of 23729440 is about 287.3618845104.

The spelling of 23729440 in words is "twenty-three million, seven hundred twenty-nine thousand, four hundred forty".