18387136 has 28 divisors (see below), whose sum is σ = 38409880. Its totient is φ = 8709120.

The previous prime is 18387121. The next prime is 18387137. The reversal of 18387136 is 63178381.

It is a junction number, because it is equal to n+sod(n) for n = 18387095 and 18387104.

It is not an unprimeable number, because it can be changed into a prime (18387137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6345 + ... + 8776.

Almost surely, 2^18387136 is an apocalyptic number.

18387136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18387136 is an abundant number, since it is smaller than the sum of its proper divisors (20022744).

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

18387136 is a wasteful number, since it uses less digits than its factorization.

18387136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15152 (or 15142 counting only the distinct ones).

The product of its digits is 24192, while the sum is 37.

The square root of 18387136 is about 4288.0223880013. The cubic root of 18387136 is about 263.9396862523.

The spelling of 18387136 in words is "eighteen million, three hundred eighty-seven thousand, one hundred thirty-six".