117939989 has 4 divisors (see below), whose sum is σ = 118256556. Its totient is φ = 117623424.

The previous prime is 117939977. The next prime is 117940003. The reversal of 117939989 is 989939711.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21252100 + 96687889 = 4610^2 + 9833^2 .

It is a cyclic number.

It is not a de Polignac number, because 117939989 - 2¹² = 117935893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117939949) 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, 157724 + ... + 158469.

It is an arithmetic number, because the mean of its divisors is an integer number (29564139).

Almost surely, 2^117939989 is an apocalyptic number.

It is an amenable number.

117939989 is a deficient number, since it is larger than the sum of its proper divisors (316567).

117939989 is an equidigital number, since it uses as much as digits as its factorization.

117939989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316566.

The product of its digits is 1102248, while the sum is 56.

The square root of 117939989 is about 10860.0179097458. The cubic root of 117939989 is about 490.4036504536.

The spelling of 117939989 in words is "one hundred seventeen million, nine hundred thirty-nine thousand, nine hundred eighty-nine".