117191988 has 24 divisors (see below), whose sum is σ = 303831360. Its totient is φ = 39063960.

The previous prime is 117191983. The next prime is 117191989. The reversal of 117191988 is 889191711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117191983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542448 + ... + 542663.

It is an arithmetic number, because the mean of its divisors is an integer number (12659640).

Almost surely, 2^117191988 is an apocalyptic number.

117191988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

117191988 is an abundant number, since it is smaller than the sum of its proper divisors (186639372).

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

117191988 is a wasteful number, since it uses less digits than its factorization.

117191988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085124 (or 1085116 counting only the distinct ones).

The product of its digits is 36288, while the sum is 45.

The square root of 117191988 is about 10825.5248371615. The cubic root of 117191988 is about 489.3647021512.

The spelling of 117191988 in words is "one hundred seventeen million, one hundred ninety-one thousand, nine hundred eighty-eight".