117989905 has 16 divisors (see below), whose sum is σ = 162590400. Its totient is φ = 81293760.

The previous prime is 117989903. The next prime is 117989939. The reversal of 117989905 is 509989711.

It is a happy number.

It is not a de Polignac number, because 117989905 - 2¹ = 117989903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117989903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55410 + ... + 57499.

It is an arithmetic number, because the mean of its divisors is an integer number (10161900).

Almost surely, 2^117989905 is an apocalyptic number.

It is an amenable number.

117989905 is a deficient number, since it is larger than the sum of its proper divisors (44600495).

117989905 is a wasteful number, since it uses less digits than its factorization.

117989905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112944.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 117989905 is about 10862.3158212234. The cubic root of 117989905 is about 490.4728255660.

The spelling of 117989905 in words is "one hundred seventeen million, nine hundred eighty-nine thousand, nine hundred five".