117997 has 8 divisors (see below), whose sum is σ = 136512. Its totient is φ = 100800.

The previous prime is 117991. The next prime is 118033. The reversal of 117997 is 799711.

It is a happy number.

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 117997 - 2³ = 117989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129 + ... + 502.

It is an arithmetic number, because the mean of its divisors is an integer number (17064).

2¹¹⁷⁹⁹⁷ is an apocalyptic number.

117997 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

117997 is a deficient number, since it is larger than the sum of its proper divisors (18515).

117997 is a wasteful number, since it uses less digits than its factorization.

117997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 3969, while the sum is 34.

The square root of 117997 is about 343.5069140498. The cubic root of 117997 is about 49.0482656449.

It can be divided in two parts, 11 and 7997, that added together give a palindrome (8008).

The spelling of 117997 in words is "one hundred seventeen thousand, nine hundred ninety-seven".