18664039 has 2 divisors, whose sum is σ = 18664040. Its totient is φ = 18664038.

The previous prime is 18664031. The next prime is 18664057. The reversal of 18664039 is 93046681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18664039 - 2³ = 18664031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18663989 and 18664007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18664031) 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 as a sum of consecutive naturals, namely, 9332019 + 9332020.

It is an arithmetic number, because the mean of its divisors is an integer number (9332020).

Almost surely, 2^18664039 is an apocalyptic number.

18664039 is a deficient number, since it is larger than the sum of its proper divisors (1).

18664039 is an equidigital number, since it uses as much as digits as its factorization.

18664039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 18664039 is about 4320.1896949092. The cubic root of 18664039 is about 265.2580327566.

The spelling of 18664039 in words is "eighteen million, six hundred sixty-four thousand, thirty-nine".