18139860 has 72 divisors (see below), whose sum is σ = 55429920. Its totient is φ = 4801728.

The previous prime is 18139859. The next prime is 18139871. The reversal of 18139860 is 6893181.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31939 + ... + 32501.

It is an arithmetic number, because the mean of its divisors is an integer number (769860).

Almost surely, 2^18139860 is an apocalyptic number.

18139860 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 18139860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27714960).

18139860 is an abundant number, since it is smaller than the sum of its proper divisors (37290060).

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

18139860 is a wasteful number, since it uses less digits than its factorization.

18139860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 757 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18139860 is about 4259.0914524109. The cubic root of 18139860 is about 262.7511609722.

The spelling of 18139860 in words is "eighteen million, one hundred thirty-nine thousand, eight hundred sixty".