18473638 has 16 divisors (see below), whose sum is σ = 28810080. Its totient is φ = 8873536.

The previous prime is 18473633. The next prime is 18473671. The reversal of 18473638 is 83637481.

It is a self number, because there is not a number n which added to its sum of digits gives 18473638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18473633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12831 + ... + 14197.

It is an arithmetic number, because the mean of its divisors is an integer number (1800630).

Almost surely, 2^18473638 is an apocalyptic number.

18473638 is a deficient number, since it is larger than the sum of its proper divisors (10336442).

18473638 is a wasteful number, since it uses less digits than its factorization.

18473638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1631.

The product of its digits is 96768, while the sum is 40.

The square root of 18473638 is about 4298.0970207756. The cubic root of 18473638 is about 264.3529389532.

The spelling of 18473638 in words is "eighteen million, four hundred seventy-three thousand, six hundred thirty-eight".