18391086 has 48 divisors (see below), whose sum is σ = 45811584. Its totient is φ = 5223312.

The previous prime is 18391019. The next prime is 18391123. The reversal of 18391086 is 68019381.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18391086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28281 + ... + 28923.

It is an arithmetic number, because the mean of its divisors is an integer number (954408).

Almost surely, 2^18391086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18391086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22905792).

18391086 is an abundant number, since it is smaller than the sum of its proper divisors (27420498).

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

18391086 is a wasteful number, since it uses less digits than its factorization.

18391086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 882 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 18391086 is about 4288.4829485495. The cubic root of 18391086 is about 263.9585851012.

The spelling of 18391086 in words is "eighteen million, three hundred ninety-one thousand, eighty-six".