18884969 has 4 divisors (see below), whose sum is σ = 19345620. Its totient is φ = 18424320.

The previous prime is 18884959. The next prime is 18884981. The reversal of 18884969 is 96948881.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8880400 + 10004569 = 2980^2 + 3163^2 .

It is a cyclic number.

It is not a de Polignac number, because 18884969 - 2⁴ = 18884953 is a prime.

It is a super-2 number, since 2×18884969² = 713284108261922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18884969.

It is not an unprimeable number, because it can be changed into a prime (18884939) 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, 230264 + ... + 230345.

It is an arithmetic number, because the mean of its divisors is an integer number (4836405).

Almost surely, 2^18884969 is an apocalyptic number.

It is an amenable number.

18884969 is a deficient number, since it is larger than the sum of its proper divisors (460651).

18884969 is an equidigital number, since it uses as much as digits as its factorization.

18884969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460650.

The product of its digits is 995328, while the sum is 53.

The square root of 18884969 is about 4345.6839507723. The cubic root of 18884969 is about 266.3005675883.

The spelling of 18884969 in words is "eighteen million, eight hundred eighty-four thousand, nine hundred sixty-nine".