18186738 has 16 divisors (see below), whose sum is σ = 37060416. Its totient is φ = 5947760.

The previous prime is 18186737. The next prime is 18186757. The reversal of 18186738 is 83768181.

It is a self number, because there is not a number n which added to its sum of digits gives 18186738.

It is not an unprimeable number, because it can be changed into a prime (18186731) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28278 + ... + 28913.

It is an arithmetic number, because the mean of its divisors is an integer number (2316276).

Almost surely, 2^18186738 is an apocalyptic number.

18186738 is an abundant number, since it is smaller than the sum of its proper divisors (18873678).

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

18186738 is a wasteful number, since it uses less digits than its factorization.

18186738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57249.

The product of its digits is 64512, while the sum is 42.

The square root of 18186738 is about 4264.5911879100. The cubic root of 18186738 is about 262.9773048313.

The spelling of 18186738 in words is "eighteen million, one hundred eighty-six thousand, seven hundred thirty-eight".