18711140 has 72 divisors (see below), whose sum is σ = 46606392. Its totient is φ = 6289920.

The previous prime is 18711139. The next prime is 18711163. The reversal of 18711140 is 4111781.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1999396 + 16711744 = 1414^2 + 4088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59624 + ... + 59936.

It is an arithmetic number, because the mean of its divisors is an integer number (647311).

Almost surely, 2^18711140 is an apocalyptic number.

18711140 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 18711140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23303196).

18711140 is an abundant number, since it is smaller than the sum of its proper divisors (27895252).

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

18711140 is a wasteful number, since it uses less digits than its factorization.

18711140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 18711140 is about 4325.6375252672. The cubic root of 18711140 is about 265.4809824145.

The spelling of 18711140 in words is "eighteen million, seven hundred eleven thousand, one hundred forty".