18442188 has 24 divisors (see below), whose sum is σ = 47813360. Its totient is φ = 6147360.

The previous prime is 18442187. The next prime is 18442201. The reversal of 18442188 is 88124481.

It is a happy number.

It is a super-2 number, since 2×18442188² = 680228596454688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18442181) 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, 85273 + ... + 85488.

Almost surely, 2^18442188 is an apocalyptic number.

18442188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18442188 is an abundant number, since it is smaller than the sum of its proper divisors (29371172).

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

18442188 is a wasteful number, since it uses less digits than its factorization.

18442188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170774 (or 170766 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18442188 is about 4294.4368664587. The cubic root of 18442188 is about 264.2028399792.

The spelling of 18442188 in words is "eighteen million, four hundred forty-two thousand, one hundred eighty-eight".