18864536 has 16 divisors (see below), whose sum is σ = 35490840. Its totient is φ = 9400320.

The previous prime is 18864533. The next prime is 18864541. The reversal of 18864536 is 63546881.

It is a junction number, because it is equal to n+sod(n) for n = 18864493 and 18864502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18864533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385 + ... + 6296.

Almost surely, 2^18864536 is an apocalyptic number.

It is an amenable number.

18864536 is a deficient number, since it is larger than the sum of its proper divisors (16626304).

18864536 is a wasteful number, since it uses less digits than its factorization.

18864536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7994 (or 7990 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 18864536 is about 4343.3323612176. The cubic root of 18864536 is about 266.2044897123.

The spelling of 18864536 in words is "eighteen million, eight hundred sixty-four thousand, five hundred thirty-six".