18739216 has 10 divisors (see below), whose sum is σ = 36307262. Its totient is φ = 9369600.

The previous prime is 18739213. The next prime is 18739223. The reversal of 18739216 is 61293781.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 5779216 = 3600^2 + 2404^2 .

It is not an unprimeable number, because it can be changed into a prime (18739211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585585 + ... + 585616.

Almost surely, 2^18739216 is an apocalyptic number.

18739216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18739216 is a deficient number, since it is larger than the sum of its proper divisors (17568046).

18739216 is a wasteful number, since it uses less digits than its factorization.

18739216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171209 (or 1171203 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 18739216 is about 4328.8816107628. The cubic root of 18739216 is about 265.6137004836.

The spelling of 18739216 in words is "eighteen million, seven hundred thirty-nine thousand, two hundred sixteen".