18438196 has 12 divisors (see below), whose sum is σ = 36876448. Its totient is φ = 7902072.

The previous prime is 18438193. The next prime is 18438221. The reversal of 18438196 is 69183481.

18438196 is an admirable number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329226 + ... + 329281.

Almost surely, 2^18438196 is an apocalyptic number.

It is an amenable number.

18438196 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18438196 is a wasteful number, since it uses less digits than its factorization.

18438196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658518 (or 658516 counting only the distinct ones).

The product of its digits is 41472, while the sum is 40.

The square root of 18438196 is about 4293.9720539379. The cubic root of 18438196 is about 264.1837754689.

The spelling of 18438196 in words is "eighteen million, four hundred thirty-eight thousand, one hundred ninety-six".