117217920 has 64 divisors (see below), whose sum is σ = 373638240. Its totient is φ = 31257600.

The previous prime is 117217879. The next prime is 117217921. The reversal of 117217920 is 29712711.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (117217921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28606 + ... + 32445.

Almost surely, 2^117217920 is an apocalyptic number.

117217920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117217920 is an abundant number, since it is smaller than the sum of its proper divisors (256420320).

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

117217920 is an equidigital number, since it uses as much as digits as its factorization.

117217920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61073 (or 61061 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 117217920 is about 10826.7224957510. The cubic root of 117217920 is about 489.4007946912.

The spelling of 117217920 in words is "one hundred seventeen million, two hundred seventeen thousand, nine hundred twenty".