18673969 has 4 divisors (see below), whose sum is σ = 18685296. Its totient is φ = 18662644.

The previous prime is 18673933. The next prime is 18673981. The reversal of 18673969 is 96937681.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18673969 is a prime.

It is a super-2 number, since 2×18673969² = 697434236425922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18673909) 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, 2659 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (4671324).

Almost surely, 2^18673969 is an apocalyptic number.

It is an amenable number.

18673969 is a deficient number, since it is larger than the sum of its proper divisors (11327).

18673969 is an equidigital number, since it uses as much as digits as its factorization.

18673969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11326.

The product of its digits is 489888, while the sum is 49.

The square root of 18673969 is about 4321.3387971785. The cubic root of 18673969 is about 265.3050669716.

The spelling of 18673969 in words is "eighteen million, six hundred seventy-three thousand, nine hundred sixty-nine".