117309 has 4 divisors (see below), whose sum is σ = 156416. Its totient is φ = 78204.

The previous prime is 117307. The next prime is 117319. The reversal of 117309 is 903711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 903711 = 3 ⋅301237.

It is not a de Polignac number, because 117309 - 2¹ = 117307 is a prime.

It is a super-2 number, since 2×117309² = 27522802962, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19549 + ... + 19554.

It is an arithmetic number, because the mean of its divisors is an integer number (39104).

2¹¹⁷³⁰⁹ is an apocalyptic number.

It is an amenable number.

117309 is a deficient number, since it is larger than the sum of its proper divisors (39107).

117309 is an equidigital number, since it uses as much as digits as its factorization.

117309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39106.

The product of its (nonzero) digits is 189, while the sum is 21.

The square root of 117309 is about 342.5040145750. The cubic root of 117309 is about 48.9527519013.

It can be divided in two parts, 11730 and 9, that multiplied together give a triangular number (105570 = T₄₅₉).

The spelling of 117309 in words is "one hundred seventeen thousand, three hundred nine".