18413868 has 48 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 5544000.

The previous prime is 18413851. The next prime is 18413893. The reversal of 18413868 is 86831481.

It is a congruent number.

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, 25918 + ... + 26618.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^18413868 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 18413868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23587200).

18413868 is an abundant number, since it is smaller than the sum of its proper divisors (28760532).

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

18413868 is a wasteful number, since it uses less digits than its factorization.

18413868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918 (or 916 counting only the distinct ones).

The product of its digits is 36864, while the sum is 39.

The square root of 18413868 is about 4291.1383105186. The cubic root of 18413868 is about 264.0675332281.

The spelling of 18413868 in words is "eighteen million, four hundred thirteen thousand, eight hundred sixty-eight".