18391104 has 112 divisors (see below), whose sum is σ = 56083200. Its totient is φ = 5902848.

The previous prime is 18391019. The next prime is 18391123. The reversal of 18391104 is 40119381.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49929 + ... + 50295.

Almost surely, 2^18391104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18391104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28041600).

18391104 is an abundant number, since it is smaller than the sum of its proper divisors (37692096).

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

18391104 is a wasteful number, since it uses less digits than its factorization.

18391104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18391104 is about 4288.4850471932. The cubic root of 18391104 is about 263.9586712163.

The spelling of 18391104 in words is "eighteen million, three hundred ninety-one thousand, one hundred four".