18289140 has 96 divisors (see below), whose sum is σ = 55399680. Its totient is φ = 4494336.

The previous prime is 18289123. The next prime is 18289151. The reversal of 18289140 is 4198281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39792 + ... + 40248.

It is an arithmetic number, because the mean of its divisors is an integer number (577080).

Almost surely, 2^18289140 is an apocalyptic number.

18289140 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 18289140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27699840).

18289140 is an abundant number, since it is smaller than the sum of its proper divisors (37110540).

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

18289140 is a wasteful number, since it uses less digits than its factorization.

18289140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18289140 is about 4276.5804096264. The cubic root of 18289140 is about 263.4699534984.

The spelling of 18289140 in words is "eighteen million, two hundred eighty-nine thousand, one hundred forty".