18051840 has 108 divisors (see below), whose sum is σ = 62497344. Its totient is φ = 4810752.

The previous prime is 18051823. The next prime is 18051851. The reversal of 18051840 is 4815081.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10737 + ... + 12303.

Almost surely, 2^18051840 is an apocalyptic number.

18051840 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 18051840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31248672).

18051840 is an abundant number, since it is smaller than the sum of its proper divisors (44445504).

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

18051840 is a wasteful number, since it uses less digits than its factorization.

18051840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594 (or 1577 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 18051840 is about 4248.7456972617. The cubic root of 18051840 is about 262.3254894529.

The spelling of 18051840 in words is "eighteen million, fifty-one thousand, eight hundred forty".