18664413 has 4 divisors (see below), whose sum is σ = 24885888. Its totient is φ = 12442940.

The previous prime is 18664411. The next prime is 18664417. The reversal of 18664413 is 31446681.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18664413 - 2¹ = 18664411 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18664411) 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, 3110733 + ... + 3110738.

It is an arithmetic number, because the mean of its divisors is an integer number (6221472).

Almost surely, 2^18664413 is an apocalyptic number.

It is an amenable number.

18664413 is a deficient number, since it is larger than the sum of its proper divisors (6221475).

18664413 is an equidigital number, since it uses as much as digits as its factorization.

18664413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6221474.

The product of its digits is 13824, while the sum is 33.

The square root of 18664413 is about 4320.2329798287. The cubic root of 18664413 is about 265.2598045389.

The spelling of 18664413 in words is "eighteen million, six hundred sixty-four thousand, four hundred thirteen".