117909890 has 16 divisors (see below), whose sum is σ = 242557632. Its totient is φ = 40426224.

The previous prime is 117909829. The next prime is 117909893. The reversal of 117909890 is 98909711.

It is not an unprimeable number, because it can be changed into a prime (117909893) 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 7 ways as a sum of consecutive naturals, for example, 842144 + ... + 842283.

It is an arithmetic number, because the mean of its divisors is an integer number (15159852).

Almost surely, 2^117909890 is an apocalyptic number.

117909890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

117909890 is an abundant number, since it is smaller than the sum of its proper divisors (124647742).

117909890 is a wasteful number, since it uses less digits than its factorization.

117909890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684441.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 117909890 is about 10858.6320501249. The cubic root of 117909890 is about 490.3619289096.

The spelling of 117909890 in words is "one hundred seventeen million, nine hundred nine thousand, eight hundred ninety".