117811836 has 72 divisors (see below), whose sum is σ = 317523024. Its totient is φ = 36702720.

The previous prime is 117811829. The next prime is 117811847. The reversal of 117811836 is 638118711.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 117811836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99166 + ... + 100346.

It is an arithmetic number, because the mean of its divisors is an integer number (4410042).

Almost surely, 2^117811836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 117811836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158761512).

117811836 is an abundant number, since it is smaller than the sum of its proper divisors (199711188).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117811836 is a wasteful number, since it uses less digits than its factorization.

117811836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371 (or 1366 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 117811836 is about 10854.1160856147. The cubic root of 117811836 is about 490.2259626982.

The spelling of 117811836 in words is "one hundred seventeen million, eight hundred eleven thousand, eight hundred thirty-six".