117838813 has 4 divisors (see below), whose sum is σ = 118172988. Its totient is φ = 117504640.

The previous prime is 117838807. The next prime is 117838859. The reversal of 117838813 is 318838711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 318838711 = 1013 ⋅314747.

It can be written as a sum of positive squares in 2 ways, for example, as 32867289 + 84971524 = 5733^2 + 9218^2 .

It is a cyclic number.

It is not a de Polignac number, because 117838813 - 2¹⁷ = 117707741 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 (117838873) 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, 166558 + ... + 167263.

It is an arithmetic number, because the mean of its divisors is an integer number (29543247).

Almost surely, 2^117838813 is an apocalyptic number.

It is an amenable number.

117838813 is a deficient number, since it is larger than the sum of its proper divisors (334175).

117838813 is an equidigital number, since it uses as much as digits as its factorization.

117838813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334174.

The product of its digits is 32256, while the sum is 40.

The square root of 117838813 is about 10855.3587227691. The cubic root of 117838813 is about 490.2633777745.

The spelling of 117838813 in words is "one hundred seventeen million, eight hundred thirty-eight thousand, eight hundred thirteen".