18944738 has 8 divisors (see below), whose sum is σ = 28471260. Its totient is φ = 9454320.

The previous prime is 18944707. The next prime is 18944759. The reversal of 18944738 is 83744981.

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 2968729 = 3997^2 + 1723^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7673 + ... + 9836.

Almost surely, 2^18944738 is an apocalyptic number.

18944738 is a deficient number, since it is larger than the sum of its proper divisors (9526522).

18944738 is a wasteful number, since it uses less digits than its factorization.

18944738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18052.

The product of its digits is 193536, while the sum is 44.

The square root of 18944738 is about 4352.5553414058. Note that the first 3 decimals coincide. The cubic root of 18944738 is about 266.5812097699.

The spelling of 18944738 in words is "eighteen million, nine hundred forty-four thousand, seven hundred thirty-eight".