18664427 has 8 divisors (see below), whose sum is σ = 19118160. Its totient is φ = 18214560.

The previous prime is 18664417. The next prime is 18664433. The reversal of 18664427 is 72446681.

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 18664427 - 2⁴ = 18664411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18664417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10349 + ... + 12017.

It is an arithmetic number, because the mean of its divisors is an integer number (2389770).

Almost surely, 2^18664427 is an apocalyptic number.

18664427 is a deficient number, since it is larger than the sum of its proper divisors (453733).

18664427 is a wasteful number, since it uses less digits than its factorization.

18664427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its digits is 64512, while the sum is 38.

The square root of 18664427 is about 4320.2346001114. The cubic root of 18664427 is about 265.2598708619.

It can be divided in two parts, 18664 and 427, that added together give a palindrome (19091).

The spelling of 18664427 in words is "eighteen million, six hundred sixty-four thousand, four hundred twenty-seven".