18977648 has 20 divisors (see below), whose sum is σ = 37185120. Its totient is φ = 9381504.

The previous prime is 18977639. The next prime is 18977723. The reversal of 18977648 is 84677981.

It is a super-2 number, since 2×18977648² = 720302247223808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18977596 and 18977605.

It is a congruent number.

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, 5240 + ... + 8087.

It is an arithmetic number, because the mean of its divisors is an integer number (1859256).

Almost surely, 2^18977648 is an apocalyptic number.

It is an amenable number.

18977648 is a deficient number, since it is larger than the sum of its proper divisors (18207472).

18977648 is a wasteful number, since it uses less digits than its factorization.

18977648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13424 (or 13418 counting only the distinct ones).

The product of its digits is 677376, while the sum is 50.

The square root of 18977648 is about 4356.3342387838. The cubic root of 18977648 is about 266.7354850164.

The spelling of 18977648 in words is "eighteen million, nine hundred seventy-seven thousand, six hundred forty-eight".