18188940 has 192 divisors, whose sum is σ = 66060288. Its totient is φ = 3628800.

The previous prime is 18188927. The next prime is 18188977. The reversal of 18188940 is 4988181.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 143157 + ... + 143283.

It is an arithmetic number, because the mean of its divisors is an integer number (344064).

Almost surely, 2^18188940 is an apocalyptic number.

18188940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18188940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33030144).

18188940 is an abundant number, since it is smaller than the sum of its proper divisors (47871348).

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

18188940 is a wasteful number, since it uses less digits than its factorization.

18188940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 186 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The square root of 18188940 is about 4264.8493525563. The cubic root of 18188940 is about 262.9879179248.

The spelling of 18188940 in words is "eighteen million, one hundred eighty-eight thousand, nine hundred forty".