117821872 has 50 divisors (see below), whose sum is σ = 266397508. Its totient is φ = 50478624.

The previous prime is 117821861. The next prime is 117821909. The reversal of 117821872 is 278128711.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36883 + ... + 39949.

Almost surely, 2^117821872 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 117821872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133198754).

117821872 is an abundant number, since it is smaller than the sum of its proper divisors (148575636).

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

117821872 is an frugal number, since it uses more digits than its factorization.

117821872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103 (or 3076 counting only the distinct ones).

The product of its digits is 12544, while the sum is 37.

The square root of 117821872 is about 10854.5783888643. The cubic root of 117821872 is about 490.2398825448.

The spelling of 117821872 in words is "one hundred seventeen million, eight hundred twenty-one thousand, eight hundred seventy-two".