18209965 has 8 divisors (see below), whose sum is σ = 21919968. Its totient is φ = 14522640.

The previous prime is 18209963. The next prime is 18209977. The reversal of 18209965 is 56990281.

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

It is not a de Polignac number, because 18209965 - 2¹ = 18209963 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 (18209963) 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, 3847 + ... + 7156.

It is an arithmetic number, because the mean of its divisors is an integer number (2739996).

Almost surely, 2^18209965 is an apocalyptic number.

It is an amenable number.

18209965 is a deficient number, since it is larger than the sum of its proper divisors (3710003).

18209965 is a wasteful number, since it uses less digits than its factorization.

18209965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11339.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 18209965 is about 4267.3135577316. The cubic root of 18209965 is about 263.0892100993.

The spelling of 18209965 in words is "eighteen million, two hundred nine thousand, nine hundred sixty-five".