117685209 has 8 divisors (see below), whose sum is σ = 156972352. Its totient is φ = 78427440.

The previous prime is 117685187. The next prime is 117685213. The reversal of 117685209 is 902586711.

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

It is not a de Polignac number, because 117685209 - 2⁷ = 117685081 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (117685289) 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, 4947 + ... + 16119.

It is an arithmetic number, because the mean of its divisors is an integer number (19621544).

Almost surely, 2^117685209 is an apocalyptic number.

It is an amenable number.

117685209 is a deficient number, since it is larger than the sum of its proper divisors (39287143).

117685209 is a wasteful number, since it uses less digits than its factorization.

117685209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14687.

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 117685209 is about 10848.2813846249. The cubic root of 117685209 is about 490.0502641759.

It can be divided in two parts, 117 and 685209, that multiplied together give a triangular number (80169453 = T₁₂₆₆₂).

The spelling of 117685209 in words is "one hundred seventeen million, six hundred eighty-five thousand, two hundred nine".