18233409 has 8 divisors (see below), whose sum is σ = 24339712. Its totient is φ = 12141360.

The previous prime is 18233389. The next prime is 18233443. The reversal of 18233409 is 90433281.

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

It is not a de Polignac number, because 18233409 - 2⁵ = 18233377 is a prime.

It is a super-2 number, since 2×18233409² = 664914407522562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18233609) 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, 94 + ... + 6039.

It is an arithmetic number, because the mean of its divisors is an integer number (3042464).

Almost surely, 2^18233409 is an apocalyptic number.

It is an amenable number.

18233409 is a deficient number, since it is larger than the sum of its proper divisors (6106303).

18233409 is an equidigital number, since it uses as much as digits as its factorization.

18233409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7127.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 18233409 is about 4270.0596014576. The cubic root of 18233409 is about 263.2020643972.

The spelling of 18233409 in words is "eighteen million, two hundred thirty-three thousand, four hundred nine".