18091080 has 128 divisors (see below), whose sum is σ = 68947200. Its totient is φ = 4133376.

The previous prime is 18091063. The next prime is 18091081. The reversal of 18091080 is 8019081.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18091081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6364 + ... + 8756.

It is an arithmetic number, because the mean of its divisors is an integer number (538650).

Almost surely, 2^18091080 is an apocalyptic number.

18091080 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 18091080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34473600).

18091080 is an abundant number, since it is smaller than the sum of its proper divisors (50856120).

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

18091080 is a wasteful number, since it uses less digits than its factorization.

18091080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420 (or 2410 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The square root of 18091080 is about 4253.3610239433. The cubic root of 18091080 is about 262.5154276647.

The spelling of 18091080 in words is "eighteen million, ninety-one thousand, eighty".