18669917 has 4 divisors (see below), whose sum is σ = 21337056. Its totient is φ = 16002780.

The previous prime is 18669907. The next prime is 18669943. The reversal of 18669917 is 71996681.

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 18669917 - 2⁶ = 18669853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18669907) 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 3 ways as a sum of consecutive naturals, for example, 1333559 + ... + 1333572.

It is an arithmetic number, because the mean of its divisors is an integer number (5334264).

Almost surely, 2^18669917 is an apocalyptic number.

It is an amenable number.

18669917 is a deficient number, since it is larger than the sum of its proper divisors (2667139).

18669917 is an equidigital number, since it uses as much as digits as its factorization.

18669917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667138.

The product of its digits is 163296, while the sum is 47.

The square root of 18669917 is about 4320.8699355570. The cubic root of 18669917 is about 265.2858763737.

The spelling of 18669917 in words is "eighteen million, six hundred sixty-nine thousand, nine hundred seventeen".