18980919 has 16 divisors (see below), whose sum is σ = 28246240. Its totient is φ = 12597120.

The previous prime is 18980893. The next prime is 18980947. The reversal of 18980919 is 91908981.

It is not a de Polignac number, because 18980919 - 2⁵ = 18980887 is a prime.

It is a super-2 number, since 2×18980919² = 720550572169122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5049 + ... + 7965.

It is an arithmetic number, because the mean of its divisors is an integer number (1765390).

Almost surely, 2^18980919 is an apocalyptic number.

18980919 is a deficient number, since it is larger than the sum of its proper divisors (9265321).

18980919 is a wasteful number, since it uses less digits than its factorization.

18980919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3167 (or 3161 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The square root of 18980919 is about 4356.7096529376. The cubic root of 18980919 is about 266.7508090377.

The spelling of 18980919 in words is "eighteen million, nine hundred eighty thousand, nine hundred nineteen".