18143916 has 72 divisors (see below), whose sum is σ = 50178240. Its totient is φ = 5086368.

The previous prime is 18143903. The next prime is 18143921. The reversal of 18143916 is 61934181.

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, 34431 + ... + 34953.

It is an arithmetic number, because the mean of its divisors is an integer number (696920).

Almost surely, 2^18143916 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 18143916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25089120).

18143916 is an abundant number, since it is smaller than the sum of its proper divisors (32034324).

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

18143916 is a wasteful number, since it uses less digits than its factorization.

18143916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 594 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 18143916 is about 4259.5675836873. The cubic root of 18143916 is about 262.7707428816.

The spelling of 18143916 in words is "eighteen million, one hundred forty-three thousand, nine hundred sixteen".