18188274 has 16 divisors (see below), whose sum is σ = 39174912. Its totient is φ = 5596368.

The previous prime is 18188267. The next prime is 18188279. The reversal of 18188274 is 47288181.

It is a happy number.

It is a super-2 number, since 2×18188274² = 661626622198152, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18188279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116514 + ... + 116669.

It is an arithmetic number, because the mean of its divisors is an integer number (2448432).

Almost surely, 2^18188274 is an apocalyptic number.

18188274 is an abundant number, since it is smaller than the sum of its proper divisors (20986638).

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

18188274 is a wasteful number, since it uses less digits than its factorization.

18188274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233201.

The product of its digits is 28672, while the sum is 39.

The square root of 18188274 is about 4264.7712717097. The cubic root of 18188274 is about 262.9847080605.

The spelling of 18188274 in words is "eighteen million, one hundred eighty-eight thousand, two hundred seventy-four".