18731040 has 48 divisors (see below), whose sum is σ = 59004288. Its totient is φ = 4994816.

The previous prime is 18731023. The next prime is 18731047. The reversal of 18731040 is 4013781.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 18731040.

It is not an unprimeable number, because it can be changed into a prime (18731047) 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, 19032 + ... + 19991.

It is an arithmetic number, because the mean of its divisors is an integer number (1229256).

Almost surely, 2^18731040 is an apocalyptic number.

18731040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18731040 is an abundant number, since it is smaller than the sum of its proper divisors (40273248).

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

18731040 is a wasteful number, since it uses less digits than its factorization.

18731040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39041 (or 39033 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 18731040 is about 4327.9371529633. The cubic root of 18731040 is about 265.5750654000.

The spelling of 18731040 in words is "eighteen million, seven hundred thirty-one thousand, forty".