18243969 has 4 divisors (see below), whose sum is σ = 24325296. Its totient is φ = 12162644.

The previous prime is 18243959. The next prime is 18243983. The reversal of 18243969 is 96934281.

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 18243969 - 2⁹ = 18243457 is a prime.

It is a super-2 number, since 2×18243969² = 665684809745922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18243969.

It is not an unprimeable number, because it can be changed into a prime (18243949) 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, 3040659 + ... + 3040664.

It is an arithmetic number, because the mean of its divisors is an integer number (6081324).

Almost surely, 2^18243969 is an apocalyptic number.

It is an amenable number.

18243969 is a deficient number, since it is larger than the sum of its proper divisors (6081327).

18243969 is an equidigital number, since it uses as much as digits as its factorization.

18243969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6081326.

The product of its digits is 93312, while the sum is 42.

The square root of 18243969 is about 4271.2959391735. The cubic root of 18243969 is about 263.2528663326.

The spelling of 18243969 in words is "eighteen million, two hundred forty-three thousand, nine hundred sixty-nine".