116991986 has 8 divisors (see below), whose sum is σ = 177602544. Its totient is φ = 57791140.

The previous prime is 116991947. The next prime is 116992009. The reversal of 116991986 is 689199611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352220 + ... + 352551.

It is an arithmetic number, because the mean of its divisors is an integer number (22200318).

Almost surely, 2^116991986 is an apocalyptic number.

116991986 is a deficient number, since it is larger than the sum of its proper divisors (60610558).

116991986 is an equidigital number, since it uses as much as digits as its factorization.

116991986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704856.

The product of its digits is 209952, while the sum is 50.

The square root of 116991986 is about 10816.2833727672. The cubic root of 116991986 is about 489.0861573704.

The spelling of 116991986 in words is "one hundred sixteen million, nine hundred ninety-one thousand, nine hundred eighty-six".