318140209 has 8 divisors (see below), whose sum is σ = 332196480. Its totient is φ = 304102656.

The previous prime is 318140183. The next prime is 318140231. The reversal of 318140209 is 902041813.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318140209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (318144209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38737 + ... + 46225.

It is an arithmetic number, because the mean of its divisors is an integer number (41524560).

Almost surely, 2^318140209 is an apocalyptic number.

It is an amenable number.

318140209 is a deficient number, since it is larger than the sum of its proper divisors (14056271).

318140209 is a wasteful number, since it uses less digits than its factorization.

318140209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9359.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 318140209 is about 17836.4853320378. The cubic root of 318140209 is about 682.6627208429.

The spelling of 318140209 in words is "three hundred eighteen million, one hundred forty thousand, two hundred nine".