18160209 has 6 divisors (see below), whose sum is σ = 26231426. Its totient is φ = 12106800.

The previous prime is 18160193. The next prime is 18160213. The reversal of 18160209 is 90206181.

It can be written as a sum of positive squares in only one way, i.e., 10870209 + 7290000 = 3297^2 + 2700^2 .

It is not a de Polignac number, because 18160209 - 2⁴ = 18160193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18160279) 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, 1008892 + ... + 1008909.

Almost surely, 2^18160209 is an apocalyptic number.

It is an amenable number.

18160209 is a deficient number, since it is larger than the sum of its proper divisors (8071217).

18160209 is a wasteful number, since it uses less digits than its factorization.

18160209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017807 (or 2017804 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 18160209 is about 4261.4796726020. The cubic root of 18160209 is about 262.8493742500.

The spelling of 18160209 in words is "eighteen million, one hundred sixty thousand, two hundred nine".