18980816 has 20 divisors (see below), whose sum is σ = 36973824. Its totient is φ = 9439200.

The previous prime is 18980813. The next prime is 18980839. The reversal of 18980816 is 61808981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 6161.

Almost surely, 2^18980816 is an apocalyptic number.

18980816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18980816 is a deficient number, since it is larger than the sum of its proper divisors (17993008).

18980816 is a wasteful number, since it uses less digits than its factorization.

18980816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410 (or 6404 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18980816 is about 4356.6978320742. The cubic root of 18980816 is about 266.7503265289.

The spelling of 18980816 in words is "eighteen million, nine hundred eighty thousand, eight hundred sixteen".