18660140 has 24 divisors (see below), whose sum is σ = 40451712. Its totient is φ = 7223040.

The previous prime is 18660133. The next prime is 18660157. The reversal of 18660140 is 4106681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14429 + ... + 15668.

It is an arithmetic number, because the mean of its divisors is an integer number (1685488).

Almost surely, 2^18660140 is an apocalyptic number.

18660140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18660140 is an abundant number, since it is smaller than the sum of its proper divisors (21791572).

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

18660140 is a wasteful number, since it uses less digits than its factorization.

18660140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30137 (or 30135 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18660140 is about 4319.7384180063. The cubic root of 18660140 is about 265.2395602796.

The spelling of 18660140 in words is "eighteen million, six hundred sixty thousand, one hundred forty".