117816885 has 48 divisors (see below), whose sum is σ = 217344816. Its totient is φ = 58834944.

The previous prime is 117816883. The next prime is 117816913. The reversal of 117816885 is 588618711.

It can be written as a sum of positive squares in 8 ways, for example, as 3048516 + 114768369 = 1746^2 + 10713^2 .

It is not a de Polignac number, because 117816885 - 2¹ = 117816883 is a prime.

It is a super-2 number, since 2×117816885² = 27761636782206450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 117816885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117816883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 257577 + ... + 258033.

It is an arithmetic number, because the mean of its divisors is an integer number (4528017).

Almost surely, 2^117816885 is an apocalyptic number.

117816885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117816885 is a deficient number, since it is larger than the sum of its proper divisors (99527931).

117816885 is a wasteful number, since it uses less digits than its factorization.

117816885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822 (or 819 counting only the distinct ones).

The product of its digits is 107520, while the sum is 45.

The square root of 117816885 is about 10854.3486677000. The cubic root of 117816885 is about 490.2329657171.

The spelling of 117816885 in words is "one hundred seventeen million, eight hundred sixteen thousand, eight hundred eighty-five".