18312416 has 48 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 8646528.

The previous prime is 18312407. The next prime is 18312421. The reversal of 18312416 is 61421381.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102215 + ... + 102393.

It is an arithmetic number, because the mean of its divisors is an integer number (793800).

Almost surely, 2^18312416 is an apocalyptic number.

18312416 is a gapful number since it is divisible by the number (16) 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 18312416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19051200).

18312416 is an abundant number, since it is smaller than the sum of its proper divisors (19789984).

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

18312416 is a wasteful number, since it uses less digits than its factorization.

18312416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351 (or 343 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 18312416 is about 4279.3008774799. The cubic root of 18312416 is about 263.5816760274.

Adding to 18312416 its reverse (61421381), we get a palindrome (79733797).

The spelling of 18312416 in words is "eighteen million, three hundred twelve thousand, four hundred sixteen".