18664401 has 8 divisors (see below), whose sum is σ = 28441024. Its totient is φ = 10665360.

The previous prime is 18664367. The next prime is 18664411. The reversal of 18664401 is 10446681.

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

It is not a de Polignac number, because 18664401 - 2⁷ = 18664273 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 (18664411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444370 + ... + 444411.

It is an arithmetic number, because the mean of its divisors is an integer number (3555128).

Almost surely, 2^18664401 is an apocalyptic number.

It is an amenable number.

18664401 is a deficient number, since it is larger than the sum of its proper divisors (9776623).

18664401 is an equidigital number, since it uses as much as digits as its factorization.

18664401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888791.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18664401 is about 4320.2315910145. The cubic root of 18664401 is about 265.2597476907.

The spelling of 18664401 in words is "eighteen million, six hundred sixty-four thousand, four hundred one".