117289387 has 4 divisors (see below), whose sum is σ = 117374040. Its totient is φ = 117204736.

The previous prime is 117289363. The next prime is 117289391. The reversal of 117289387 is 783982711.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117289387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117289327) 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, 40213 + ... + 43030.

It is an arithmetic number, because the mean of its divisors is an integer number (29343510).

Almost surely, 2^117289387 is an apocalyptic number.

117289387 is a deficient number, since it is larger than the sum of its proper divisors (84653).

117289387 is an equidigital number, since it uses as much as digits as its factorization.

117289387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84652.

The product of its digits is 169344, while the sum is 46.

The square root of 117289387 is about 10830.0224838178. The cubic root of 117289387 is about 489.5002359734.

It can be divided in two parts, 11728 and 9387, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 117289387 in words is "one hundred seventeen million, two hundred eighty-nine thousand, three hundred eighty-seven".