18385564 has 12 divisors (see below), whose sum is σ = 32314464. Its totient is φ = 9152864.

The previous prime is 18385547. The next prime is 18385607. The reversal of 18385564 is 46558381.

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, 8932 + ... + 10795.

It is an arithmetic number, because the mean of its divisors is an integer number (2692872).

Almost surely, 2^18385564 is an apocalyptic number.

It is an amenable number.

18385564 is a deficient number, since it is larger than the sum of its proper divisors (13928900).

18385564 is a wasteful number, since it uses less digits than its factorization.

18385564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19964 (or 19962 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 18385564 is about 4287.8390828015. The cubic root of 18385564 is about 263.9321642360.

The spelling of 18385564 in words is "eighteen million, three hundred eighty-five thousand, five hundred sixty-four".