117899805 has 16 divisors (see below), whose sum is σ = 193241664. Its totient is φ = 61345920.

The previous prime is 117899801. The next prime is 117899809. The reversal of 117899805 is 508998711.

It is an interprime number because it is at equal distance from previous prime (117899801) and next prime (117899809).

It is not a de Polignac number, because 117899805 - 2² = 117899801 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117899801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95239 + ... + 96468.

It is an arithmetic number, because the mean of its divisors is an integer number (12077604).

Almost surely, 2^117899805 is an apocalyptic number.

117899805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

117899805 is a deficient number, since it is larger than the sum of its proper divisors (75341859).

117899805 is a wasteful number, since it uses less digits than its factorization.

117899805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191756.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 117899805 is about 10858.1676631004. The cubic root of 117899805 is about 490.3479480607.

The spelling of 117899805 in words is "one hundred seventeen million, eight hundred ninety-nine thousand, eight hundred five".