18389964 has 24 divisors (see below), whose sum is σ = 42981120. Its totient is φ = 6119824.

The previous prime is 18389957. The next prime is 18389989. The reversal of 18389964 is 46998381.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11017 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (1790880).

Almost surely, 2^18389964 is an apocalyptic number.

It is an amenable number.

18389964 is an abundant number, since it is smaller than the sum of its proper divisors (24591156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18389964 is a wasteful number, since it uses less digits than its factorization.

18389964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2549 (or 2547 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 18389964 is about 4288.3521310639. The cubic root of 18389964 is about 263.9532171464.

The spelling of 18389964 in words is "eighteen million, three hundred eighty-nine thousand, nine hundred sixty-four".