117905789 has 4 divisors (see below), whose sum is σ = 118054524. Its totient is φ = 117757056.

The previous prime is 117905771. The next prime is 117905813. The reversal of 117905789 is 987509711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78943225 + 38962564 = 8885^2 + 6242^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117905789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117905719) 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, 73172 + ... + 74765.

It is an arithmetic number, because the mean of its divisors is an integer number (29513631).

Almost surely, 2^117905789 is an apocalyptic number.

It is an amenable number.

117905789 is a deficient number, since it is larger than the sum of its proper divisors (148735).

117905789 is an equidigital number, since it uses as much as digits as its factorization.

117905789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148734.

The product of its (nonzero) digits is 158760, while the sum is 47.

The square root of 117905789 is about 10858.4432125420. The cubic root of 117905789 is about 490.3562437840.

The spelling of 117905789 in words is "one hundred seventeen million, nine hundred five thousand, seven hundred eighty-nine".