18431830209 has 8 divisors (see below), whose sum is σ = 26466217792. Its totient is φ = 11342664720.

The previous prime is 18431830187. The next prime is 18431830231. The reversal of 18431830209 is 90203813481.

It is an interprime number because it is at equal distance from previous prime (18431830187) and next prime (18431830231).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18431830209 - 2¹² = 18431826113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 472611031 = 18431830209 / (1 + 8 + 4 + 3 + 1 + 8 + 3 + 0 + 2 + 0 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18431830279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236305477 + ... + 236305554.

It is an arithmetic number, because the mean of its divisors is an integer number (3308277224).

Almost surely, 2^18431830209 is an apocalyptic number.

It is an amenable number.

18431830209 is a deficient number, since it is larger than the sum of its proper divisors (8034387583).

18431830209 is a wasteful number, since it uses less digits than its factorization.

18431830209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472611047.

The product of its (nonzero) digits is 41472, while the sum is 39.

The spelling of 18431830209 in words is "eighteen billion, four hundred thirty-one million, eight hundred thirty thousand, two hundred nine".