18451140 has 48 divisors (see below), whose sum is σ = 51979200. Its totient is φ = 4890240.

The previous prime is 18451133. The next prime is 18451151. The reversal of 18451140 is 4115481.

It is a self number, because there is not a number n which added to its sum of digits gives 18451140.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10011 + ... + 11709.

It is an arithmetic number, because the mean of its divisors is an integer number (1082900).

Almost surely, 2^18451140 is an apocalyptic number.

18451140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18451140 is an abundant number, since it is smaller than the sum of its proper divisors (33528060).

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

18451140 is a wasteful number, since it uses less digits than its factorization.

18451140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892 (or 1890 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 18451140 is about 4295.4790186893. The cubic root of 18451140 is about 264.2455818570.

The spelling of 18451140 in words is "eighteen million, four hundred fifty-one thousand, one hundred forty".