117891786 has 16 divisors (see below), whose sum is σ = 243914400. Its totient is φ = 37942128.

The previous prime is 117891749. The next prime is 117891797. The reversal of 117891786 is 687198711.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338596 + ... + 338943.

It is an arithmetic number, because the mean of its divisors is an integer number (15244650).

Almost surely, 2^117891786 is an apocalyptic number.

117891786 is an abundant number, since it is smaller than the sum of its proper divisors (126022614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117891786 is a wasteful number, since it uses less digits than its factorization.

117891786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677573.

The product of its digits is 169344, while the sum is 48.

The square root of 117891786 is about 10857.7983956233. The cubic root of 117891786 is about 490.3368307414.

The spelling of 117891786 in words is "one hundred seventeen million, eight hundred ninety-one thousand, seven hundred eighty-six".