18676021 has 12 divisors (see below), whose sum is σ = 23113632. Its totient is φ = 14775696.

The previous prime is 18676001. The next prime is 18676039. The reversal of 18676021 is 12067681.

It is not a de Polignac number, because 18676021 - 2⁵ = 18675989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18676001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6711 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (1926136).

Almost surely, 2^18676021 is an apocalyptic number.

It is an amenable number.

18676021 is a deficient number, since it is larger than the sum of its proper divisors (4437611).

18676021 is a wasteful number, since it uses less digits than its factorization.

18676021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15820 (or 15807 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18676021 is about 4321.5762170764. The cubic root of 18676021 is about 265.3147843499.

The spelling of 18676021 in words is "eighteen million, six hundred seventy-six thousand, twenty-one".