18416238 has 16 divisors (see below), whose sum is σ = 38434176. Its totient is φ = 5871800.

The previous prime is 18416231. The next prime is 18416267. The reversal of 18416238 is 83261481.

It is a junction number, because it is equal to n+sod(n) for n = 18416199 and 18416208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18416231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66588 + ... + 66863.

It is an arithmetic number, because the mean of its divisors is an integer number (2402136).

Almost surely, 2^18416238 is an apocalyptic number.

18416238 is an abundant number, since it is smaller than the sum of its proper divisors (20017938).

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

18416238 is a wasteful number, since it uses less digits than its factorization.

18416238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133479.

The product of its digits is 9216, while the sum is 33.

The square root of 18416238 is about 4291.4144521358. The cubic root of 18416238 is about 264.0788618855.

The spelling of 18416238 in words is "eighteen million, four hundred sixteen thousand, two hundred thirty-eight".