18642140 has 24 divisors (see below), whose sum is σ = 42707952. Its totient is φ = 6778880.

The previous prime is 18642133. The next prime is 18642163. The reversal of 18642140 is 4124681.

It is a congruent number.

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, 42149 + ... + 42588.

It is an arithmetic number, because the mean of its divisors is an integer number (1779498).

Almost surely, 2^18642140 is an apocalyptic number.

18642140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18642140 is an abundant number, since it is smaller than the sum of its proper divisors (24065812).

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

18642140 is a wasteful number, since it uses less digits than its factorization.

18642140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84757 (or 84755 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18642140 is about 4317.6544558359. The cubic root of 18642140 is about 265.1542474497.

It can be divided in two parts, 1864 and 2140, that added together give a palindrome (4004).

The spelling of 18642140 in words is "eighteen million, six hundred forty-two thousand, one hundred forty".