117887987 has 16 divisors (see below), whose sum is σ = 141158400. Its totient is φ = 96314400.

The previous prime is 117887933. The next prime is 117888011. The reversal of 117887987 is 789788711.

It is a de Polignac number, because none of the positive numbers 2^k-117887987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117886987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12362 + ... + 19712.

It is an arithmetic number, because the mean of its divisors is an integer number (8822400).

Almost surely, 2^117887987 is an apocalyptic number.

117887987 is a deficient number, since it is larger than the sum of its proper divisors (23270413).

117887987 is an equidigital number, since it uses as much as digits as its factorization.

117887987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466.

The product of its digits is 1580544, while the sum is 56.

The square root of 117887987 is about 10857.6234508294. The cubic root of 117887987 is about 490.3315637371.

The spelling of 117887987 in words is "one hundred seventeen million, eight hundred eighty-seven thousand, nine hundred eighty-seven".