18189080 has 128 divisors (see below), whose sum is σ = 53222400. Its totient is φ = 5432832.

The previous prime is 18189077. The next prime is 18189097. The reversal of 18189080 is 8098181.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 18189080.

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, 69029 + ... + 69291.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

Almost surely, 2^18189080 is an apocalyptic number.

18189080 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 18189080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611200).

18189080 is an abundant number, since it is smaller than the sum of its proper divisors (35033320).

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

18189080 is a wasteful number, since it uses less digits than its factorization.

18189080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 18189080 is about 4264.8657657657. The cubic root of 18189080 is about 262.9885926611.

The spelling of 18189080 in words is "eighteen million, one hundred eighty-nine thousand, eighty".