18042944 has 14 divisors (see below), whose sum is σ = 35804094. Its totient is φ = 9021440.

The previous prime is 18042923. The next prime is 18042979. The reversal of 18042944 is 44924081.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 1721344 = 4040^2 + 1312^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 18042944.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140897 + ... + 141024.

Almost surely, 2^18042944 is an apocalyptic number.

It is an amenable number.

18042944 is a deficient number, since it is larger than the sum of its proper divisors (17761150).

18042944 is an equidigital number, since it uses as much as digits as its factorization.

18042944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281933 (or 281923 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 18042944 is about 4247.6986710453. The cubic root of 18042944 is about 262.2823907808.

The spelling of 18042944 in words is "eighteen million, forty-two thousand, nine hundred forty-four".