18944040 has 32 divisors (see below), whose sum is σ = 56832480. Its totient is φ = 5051712.

The previous prime is 18944039. The next prime is 18944053. The reversal of 18944040 is 4044981.

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 = 18943989 and 18944007.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78814 + ... + 79053.

It is an arithmetic number, because the mean of its divisors is an integer number (1776015).

Almost surely, 2^18944040 is an apocalyptic number.

18944040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18944040 is an abundant number, since it is smaller than the sum of its proper divisors (37888440).

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

18944040 is a wasteful number, since it uses less digits than its factorization.

18944040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157881 (or 157877 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18944040 is about 4352.4751578843. The cubic root of 18944040 is about 266.5779357566.

The spelling of 18944040 in words is "eighteen million, nine hundred forty-four thousand, forty".