117891870 has 16 divisors (see below), whose sum is σ = 282940560. Its totient is φ = 31437824.

The previous prime is 117891863. The next prime is 117891871. The reversal of 117891870 is 78198711.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117891871) 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, 1964835 + ... + 1964894.

It is an arithmetic number, because the mean of its divisors is an integer number (17683785).

Almost surely, 2^117891870 is an apocalyptic number.

117891870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

117891870 is an abundant number, since it is smaller than the sum of its proper divisors (165048690).

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

117891870 is a wasteful number, since it uses less digits than its factorization.

117891870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929739.

The product of its (nonzero) digits is 28224, while the sum is 42.

The square root of 117891870 is about 10857.8022638101. The cubic root of 117891870 is about 490.3369471993.

The spelling of 117891870 in words is "one hundred seventeen million, eight hundred ninety-one thousand, eight hundred seventy".