18407944 has 16 divisors (see below), whose sum is σ = 35448300. Its totient is φ = 8955072.

The previous prime is 18407933. The next prime is 18407947. The reversal of 18407944 is 44970481.

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 3844 = 4290^2 + 62^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (18407947) 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, 30799 + ... + 31390.

Almost surely, 2^18407944 is an apocalyptic number.

It is an amenable number.

18407944 is a deficient number, since it is larger than the sum of its proper divisors (17040356).

18407944 is a wasteful number, since it uses less digits than its factorization.

18407944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62232 (or 62228 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 18407944 is about 4290.4479952564. The cubic root of 18407944 is about 264.0392121125.

The spelling of 18407944 in words is "eighteen million, four hundred seven thousand, nine hundred forty-four".