18143744 has 20 divisors (see below), whose sum is σ = 36253074. Its totient is φ = 9071616.

The previous prime is 18143729. The next prime is 18143761. The reversal of 18143744 is 44734181.

It can be written as a sum of positive squares in only one way, i.e., 11833600 + 6310144 = 3440^2 + 2512^2 .

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 18143744.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17207 + ... + 18230.

Almost surely, 2^18143744 is an apocalyptic number.

It is an amenable number.

18143744 is a deficient number, since it is larger than the sum of its proper divisors (18109330).

18143744 is an frugal number, since it uses more digits than its factorization.

18143744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35455 (or 35439 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 18143744 is about 4259.5473937967. The cubic root of 18143744 is about 262.7699125443.

The spelling of 18143744 in words is "eighteen million, one hundred forty-three thousand, seven hundred forty-four".