18031086 has 56 divisors (see below), whose sum is σ = 41315400. Its totient is φ = 5898096.

The previous prime is 18031063. The next prime is 18031109. The reversal of 18031086 is 68013081.

It is an interprime number because it is at equal distance from previous prime (18031063) and next prime (18031109).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 120940 + ... + 121088.

It is an arithmetic number, because the mean of its divisors is an integer number (737775).

Almost surely, 2^18031086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18031086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20657700).

18031086 is an abundant number, since it is smaller than the sum of its proper divisors (23284314).

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

18031086 is an equidigital number, since it uses as much as digits as its factorization.

18031086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18031086 is about 4246.3026269921. The cubic root of 18031086 is about 262.2249200011.

The spelling of 18031086 in words is "eighteen million, thirty-one thousand, eighty-six".