18349209 has 6 divisors (see below), whose sum is σ = 26504426. Its totient is φ = 12232800.

The previous prime is 18349187. The next prime is 18349211. The reversal of 18349209 is 90294381.

It can be written as a sum of positive squares in only one way, i.e., 18249984 + 99225 = 4272^2 + 315^2 .

It is not a de Polignac number, because 18349209 - 2⁷ = 18349081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18349229) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1019392 + ... + 1019409.

Almost surely, 2^18349209 is an apocalyptic number.

It is an amenable number.

18349209 is a deficient number, since it is larger than the sum of its proper divisors (8155217).

18349209 is a wasteful number, since it uses less digits than its factorization.

18349209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038807 (or 2038804 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18349209 is about 4283.5976701833. The cubic root of 18349209 is about 263.7580858987.

The spelling of 18349209 in words is "eighteen million, three hundred forty-nine thousand, two hundred nine".