18007940 has 12 divisors (see below), whose sum is σ = 37816716. Its totient is φ = 7203168.

The previous prime is 18007939. The next prime is 18007963. The reversal of 18007940 is 4970081.

It can be written as a sum of positive squares in 2 ways, for example, as 2829124 + 15178816 = 1682^2 + 3896^2 .

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, 450179 + ... + 450218.

It is an arithmetic number, because the mean of its divisors is an integer number (3151393).

Almost surely, 2^18007940 is an apocalyptic number.

18007940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18007940 is an abundant number, since it is smaller than the sum of its proper divisors (19808776).

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

18007940 is a wasteful number, since it uses less digits than its factorization.

18007940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900406 (or 900404 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18007940 is about 4243.5763219247. The cubic root of 18007940 is about 262.1126683612.

The spelling of 18007940 in words is "eighteen million, seven thousand, nine hundred forty".