18638121 has 8 divisors (see below), whose sum is σ = 25522624. Its totient is φ = 12089520.

The previous prime is 18638111. The next prime is 18638131. The reversal of 18638121 is 12183681.

It is an interprime number because it is at equal distance from previous prime (18638111) and next prime (18638131).

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

It is not a de Polignac number, because 18638121 - 2⁵ = 18638089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18638101) 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, 83845 + ... + 84066.

It is an arithmetic number, because the mean of its divisors is an integer number (3190328).

Almost surely, 2^18638121 is an apocalyptic number.

It is an amenable number.

18638121 is a deficient number, since it is larger than the sum of its proper divisors (6884503).

18638121 is a wasteful number, since it uses less digits than its factorization.

18638121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167951.

The product of its digits is 2304, while the sum is 30.

The square root of 18638121 is about 4317.1890160149. The cubic root of 18638121 is about 265.1351914917.

The spelling of 18638121 in words is "eighteen million, six hundred thirty-eight thousand, one hundred twenty-one".