18972669 has 4 divisors (see below), whose sum is σ = 25296896. Its totient is φ = 12648444.

The previous prime is 18972661. The next prime is 18972727. The reversal of 18972669 is 96627981.

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 not a de Polignac number, because 18972669 - 2³ = 18972661 is a prime.

It is a super-2 number, since 2×18972669² = 719924337967122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18972661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3162109 + ... + 3162114.

It is an arithmetic number, because the mean of its divisors is an integer number (6324224).

Almost surely, 2^18972669 is an apocalyptic number.

It is an amenable number.

18972669 is a deficient number, since it is larger than the sum of its proper divisors (6324227).

18972669 is an equidigital number, since it uses as much as digits as its factorization.

18972669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6324226.

The product of its digits is 326592, while the sum is 48.

The square root of 18972669 is about 4355.7627345851. The cubic root of 18972669 is about 266.7121559551.

The spelling of 18972669 in words is "eighteen million, nine hundred seventy-two thousand, six hundred sixty-nine".