117909 has 16 divisors (see below), whose sum is σ = 191040. Its totient is φ = 71280.

The previous prime is 117899. The next prime is 117911. The reversal of 117909 is 909711.

It is not a de Polignac number, because 117909 - 2⁵ = 117877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

117909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99 + ... + 495.

It is an arithmetic number, because the mean of its divisors is an integer number (11940).

2¹¹⁷⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

117909 is a deficient number, since it is larger than the sum of its proper divisors (73131).

117909 is a wasteful number, since it uses less digits than its factorization.

117909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 411 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 117909 is about 343.3787995785. The cubic root of 117909 is about 49.0360695133.

The spelling of 117909 in words is "one hundred seventeen thousand, nine hundred nine".