18638149 has 8 divisors (see below), whose sum is σ = 19152000. Its totient is φ = 18127200.

The previous prime is 18638131. The next prime is 18638177. The reversal of 18638149 is 94183681.

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

It is a cyclic number.

It is not a de Polignac number, because 18638149 - 2⁹ = 18637637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18638189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20004 + ... + 20914.

It is an arithmetic number, because the mean of its divisors is an integer number (2394000).

Almost surely, 2^18638149 is an apocalyptic number.

It is an amenable number.

18638149 is a deficient number, since it is larger than the sum of its proper divisors (513851).

18638149 is an equidigital number, since it uses as much as digits as its factorization.

18638149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

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

The square root of 18638149 is about 4317.1922588646. The cubic root of 18638149 is about 265.1353242623.

The spelling of 18638149 in words is "eighteen million, six hundred thirty-eight thousand, one hundred forty-nine".