18509136 has 20 divisors (see below), whose sum is σ = 47815392. Its totient is φ = 6169696.

The previous prime is 18509129. The next prime is 18509143. The reversal of 18509136 is 63190581.

It is an interprime number because it is at equal distance from previous prime (18509129) and next prime (18509143).

It is a junction number, because it is equal to n+sod(n) for n = 18509097 and 18509106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192756 + ... + 192851.

Almost surely, 2^18509136 is an apocalyptic number.

18509136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18509136 is an abundant number, since it is smaller than the sum of its proper divisors (29306256).

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

18509136 is a wasteful number, since it uses less digits than its factorization.

18509136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385618 (or 385612 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 18509136 is about 4302.2245408626. The cubic root of 18509136 is about 264.5221529872.

The spelling of 18509136 in words is "eighteen million, five hundred nine thousand, one hundred thirty-six".