209085907 has 8 divisors (see below), whose sum is σ = 221583600. Its totient is φ = 196610304.

The previous prime is 209085883. The next prime is 209085923. The reversal of 209085907 is 709580902.

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

It is a de Polignac number, because none of the positive numbers 2^k-209085907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209085907.

It is not an unprimeable number, because it can be changed into a prime (209085997) 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, 16519 + ... + 26287.

It is an arithmetic number, because the mean of its divisors is an integer number (27697950).

Almost surely, 2^209085907 is an apocalyptic number.

209085907 is a deficient number, since it is larger than the sum of its proper divisors (12497693).

209085907 is a wasteful number, since it uses less digits than its factorization.

209085907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11045.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 209085907 is about 14459.8031452714. The cubic root of 209085907 is about 593.5285127423.

The spelling of 209085907 in words is "two hundred nine million, eighty-five thousand, nine hundred seven".