117445987 has 4 divisors (see below), whose sum is σ = 117473080. Its totient is φ = 117418896.

The previous prime is 117445963. The next prime is 117446009. The reversal of 117445987 is 789544711.

It is a happy number.

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

It is a 4-Lehmer number, since φ(117445987) divides (117445987-1)⁴.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117445987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117445907) 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, 5418 + ... + 16255.

It is an arithmetic number, because the mean of its divisors is an integer number (29368270).

It is a Poulet number, since it divides 2^117445986-1.

Almost surely, 2^117445987 is an apocalyptic number.

117445987 is the 5419-th decagonal number.

117445987 is a deficient number, since it is larger than the sum of its proper divisors (27093).

117445987 is an equidigital number, since it uses as much as digits as its factorization.

117445987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27092.

The product of its digits is 282240, while the sum is 46.

The square root of 117445987 is about 10837.2499740478. The cubic root of 117445987 is about 489.7179926643.

The spelling of 117445987 in words is "one hundred seventeen million, four hundred forty-five thousand, nine hundred eighty-seven".