18031104 has 240 divisors, whose sum is σ = 65537472. Its totient is φ = 4644864.

The previous prime is 18031063. The next prime is 18031109. The reversal of 18031104 is 40113081.

It is a super-2 number, since 2×18031104² = 650241422917632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (18031109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 419307 + ... + 419349.

Almost surely, 2^18031104 is an apocalyptic number.

18031104 is a gapful number since it is divisible by the number (14) 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 18031104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32768736).

18031104 is an abundant number, since it is smaller than the sum of its proper divisors (47506368).

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

18031104 is a wasteful number, since it uses less digits than its factorization.

18031104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18031104 is about 4246.3047464825. The cubic root of 18031104 is about 262.2250072587.

Adding to 18031104 its reverse (40113081), we get a palindrome (58144185).

The spelling of 18031104 in words is "eighteen million, thirty-one thousand, one hundred four".