117991407 has 8 divisors (see below), whose sum is σ = 166576176. Its totient is φ = 74033792.

The previous prime is 117991369. The next prime is 117991427. The reversal of 117991407 is 704199711.

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

It is a cyclic number.

It is not a de Polignac number, because 117991407 - 2¹⁴ = 117975023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117991427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1156728 + ... + 1156829.

It is an arithmetic number, because the mean of its divisors is an integer number (20822022).

Almost surely, 2^117991407 is an apocalyptic number.

117991407 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

117991407 is a deficient number, since it is larger than the sum of its proper divisors (48584769).

117991407 is a wasteful number, since it uses less digits than its factorization.

117991407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313577.

The product of its (nonzero) digits is 15876, while the sum is 39.

The square root of 117991407 is about 10862.3849591146. The cubic root of 117991407 is about 490.4749067809.

The spelling of 117991407 in words is "one hundred seventeen million, nine hundred ninety-one thousand, four hundred seven".