18132440 has 16 divisors (see below), whose sum is σ = 40798080. Its totient is φ = 7252960.

The previous prime is 18132437. The next prime is 18132451. The reversal of 18132440 is 4423181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226616 + ... + 226695.

It is an arithmetic number, because the mean of its divisors is an integer number (2549880).

Almost surely, 2^18132440 is an apocalyptic number.

18132440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18132440 is an abundant number, since it is smaller than the sum of its proper divisors (22665640).

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

18132440 is a wasteful number, since it uses less digits than its factorization.

18132440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453322 (or 453318 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18132440 is about 4258.2202855184. The cubic root of 18132440 is about 262.7153304953.

The spelling of 18132440 in words is "eighteen million, one hundred thirty-two thousand, four hundred forty".