117812839 has 4 divisors (see below), whose sum is σ = 124743024. Its totient is φ = 110882656.

The previous prime is 117812837. The next prime is 117812869. The reversal of 117812839 is 938218711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938218711 = 6691 ⋅140221.

It is a cyclic number.

It is not a de Polignac number, because 117812839 - 2¹ = 117812837 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117812837) 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, 3465067 + ... + 3465100.

It is an arithmetic number, because the mean of its divisors is an integer number (31185756).

Almost surely, 2^117812839 is an apocalyptic number.

117812839 is a deficient number, since it is larger than the sum of its proper divisors (6930185).

117812839 is an equidigital number, since it uses as much as digits as its factorization.

117812839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6930184.

The product of its digits is 24192, while the sum is 40.

The square root of 117812839 is about 10854.1622891866. The cubic root of 117812839 is about 490.2273538862.

The spelling of 117812839 in words is "one hundred seventeen million, eight hundred twelve thousand, eight hundred thirty-nine".