18997316 has 12 divisors (see below), whose sum is σ = 35802732. Its totient is φ = 8767968.

The previous prime is 18997273. The next prime is 18997331. The reversal of 18997316 is 61379981.

It can be written as a sum of positive squares in 2 ways, for example, as 2220100 + 16777216 = 1490^2 + 4096^2 .

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, 182615 + ... + 182718.

It is an arithmetic number, because the mean of its divisors is an integer number (2983561).

Almost surely, 2^18997316 is an apocalyptic number.

It is an amenable number.

18997316 is a deficient number, since it is larger than the sum of its proper divisors (16805416).

18997316 is a wasteful number, since it uses less digits than its factorization.

18997316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365350 (or 365348 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 18997316 is about 4358.5910567522. The cubic root of 18997316 is about 266.8275993857.

The spelling of 18997316 in words is "eighteen million, nine hundred ninety-seven thousand, three hundred sixteen".