117189820 has 48 divisors (see below), whose sum is σ = 272186208. Its totient is φ = 42024960.

The previous prime is 117189817. The next prime is 117189829. The reversal of 117189820 is 28981711.

It is a self number, because there is not a number n which added to its sum of digits gives 117189820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117189829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12412 + ... + 19708.

It is an arithmetic number, because the mean of its divisors is an integer number (5670546).

Almost surely, 2^117189820 is an apocalyptic number.

117189820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 117189820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136093104).

117189820 is an abundant number, since it is smaller than the sum of its proper divisors (154996388).

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

117189820 is a wasteful number, since it uses less digits than its factorization.

117189820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7390 (or 7388 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 117189820 is about 10825.4247029851. The cubic root of 117189820 is about 489.3616844556.

The spelling of 117189820 in words is "one hundred seventeen million, one hundred eighty-nine thousand, eight hundred twenty".