117172305 has 16 divisors (see below), whose sum is σ = 208306560. Its totient is φ = 62491824.

The previous prime is 117172261. The next prime is 117172337. The reversal of 117172305 is 503271711.

It is a happy number.

It is not a de Polignac number, because 117172305 - 2¹⁸ = 116910161 is a prime.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 433837 + ... + 434106.

It is an arithmetic number, because the mean of its divisors is an integer number (13019160).

Almost surely, 2^117172305 is an apocalyptic number.

117172305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117172305 is a deficient number, since it is larger than the sum of its proper divisors (91134255).

117172305 is an equidigital number, since it uses as much as digits as its factorization.

117172305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867957 (or 867951 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 27.

The square root of 117172305 is about 10824.6156975664. The cubic root of 117172305 is about 489.3373035070.

The spelling of 117172305 in words is "one hundred seventeen million, one hundred seventy-two thousand, three hundred five".