18217080 has 96 divisors (see below), whose sum is σ = 67672800. Its totient is φ = 4163328.

The previous prime is 18217063. The next prime is 18217097. The reversal of 18217080 is 8071281.

It is an interprime number because it is at equal distance from previous prime (18217063) and next prime (18217097).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1095 + ... + 6134.

It is an arithmetic number, because the mean of its divisors is an integer number (704925).

Almost surely, 2^18217080 is an apocalyptic number.

18217080 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 18217080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33836400).

18217080 is an abundant number, since it is smaller than the sum of its proper divisors (49455720).

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

18217080 is a wasteful number, since it uses less digits than its factorization.

18217080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7253 (or 7246 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18217080 is about 4268.1471389820. The cubic root of 18217080 is about 263.1234703883.

The spelling of 18217080 in words is "eighteen million, two hundred seventeen thousand, eighty".