18642338 has 16 divisors (see below), whose sum is σ = 32852736. Its totient is φ = 7821840.

The previous prime is 18642329. The next prime is 18642343. The reversal of 18642338 is 83324681.

It is a happy number.

It is a super-2 number, since 2×18642338² = 695073532212488, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18642298 and 18642307.

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, 32306 + ... + 32877.

It is an arithmetic number, because the mean of its divisors is an integer number (2053296).

Almost surely, 2^18642338 is an apocalyptic number.

18642338 is a deficient number, since it is larger than the sum of its proper divisors (14210398).

18642338 is a wasteful number, since it uses less digits than its factorization.

18642338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65209.

The product of its digits is 27648, while the sum is 35.

The square root of 18642338 is about 4317.6773848911. The cubic root of 18642338 is about 265.1551861895.

It can be divided in two parts, 186 and 42338, that added together give a palindrome (42524).

The spelling of 18642338 in words is "eighteen million, six hundred forty-two thousand, three hundred thirty-eight".