18638194 has 8 divisors (see below), whose sum is σ = 28374768. Its totient is φ = 9179940.

The previous prime is 18638189. The next prime is 18638197. The reversal of 18638194 is 49183681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×18638194³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18638197) 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, 69412 + ... + 69679.

It is an arithmetic number, because the mean of its divisors is an integer number (3546846).

Almost surely, 2^18638194 is an apocalyptic number.

18638194 is a deficient number, since it is larger than the sum of its proper divisors (9736574).

18638194 is a wasteful number, since it uses less digits than its factorization.

18638194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139160.

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

The square root of 18638194 is about 4317.1974705820. The cubic root of 18638194 is about 265.1355376433.

The spelling of 18638194 in words is "eighteen million, six hundred thirty-eight thousand, one hundred ninety-four".