18681136 has 10 divisors (see below), whose sum is σ = 36194732. Its totient is φ = 9340560.

The previous prime is 18681053. The next prime is 18681139. The reversal of 18681136 is 63118681.

It is not an unprimeable number, because it can be changed into a prime (18681139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583770 + ... + 583801.

Almost surely, 2^18681136 is an apocalyptic number.

18681136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18681136 is a deficient number, since it is larger than the sum of its proper divisors (17513596).

18681136 is a wasteful number, since it uses less digits than its factorization.

18681136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167579 (or 1167573 counting only the distinct ones).

The product of its digits is 6912, while the sum is 34.

The square root of 18681136 is about 4322.1679745239. The cubic root of 18681136 is about 265.3390036638.

The spelling of 18681136 in words is "eighteen million, six hundred eighty-one thousand, one hundred thirty-six".