18440744 has 16 divisors (see below), whose sum is σ = 39516000. Its totient is φ = 7903152.

The previous prime is 18440743. The next prime is 18440791. The reversal of 18440744 is 44704481.

It is a super-2 number, since 2×18440744² = 680122078547072, 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 18440744.

It is not an unprimeable number, because it can be changed into a prime (18440743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164594 + ... + 164705.

It is an arithmetic number, because the mean of its divisors is an integer number (2469750).

Almost surely, 2^18440744 is an apocalyptic number.

18440744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18440744 is an abundant number, since it is smaller than the sum of its proper divisors (21075256).

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

18440744 is a wasteful number, since it uses less digits than its factorization.

18440744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329312 (or 329308 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 18440744 is about 4294.2687386795. The cubic root of 18440744 is about 264.1959442164.

The spelling of 18440744 in words is "eighteen million, four hundred forty thousand, seven hundred forty-four".