117905906 has 8 divisors (see below), whose sum is σ = 186167280. Its totient is φ = 55850148.

The previous prime is 117905903. The next prime is 117905929. The reversal of 117905906 is 609509711.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 3102787 = 117905906 / (1 + 1 + 7 + 9 + 0 + 5 + 9 + 0 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 117905906.

It is not an unprimeable number, because it can be changed into a prime (117905903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551356 + ... + 1551431.

It is an arithmetic number, because the mean of its divisors is an integer number (23270910).

Almost surely, 2^117905906 is an apocalyptic number.

117905906 is a deficient number, since it is larger than the sum of its proper divisors (68261374).

117905906 is a wasteful number, since it uses less digits than its factorization.

117905906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102808.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 117905906 is about 10858.4486000533. The cubic root of 117905906 is about 490.3564059804.

It can be divided in two parts, 117905 and 906, that added together give a palindrome (118811).

The spelling of 117905906 in words is "one hundred seventeen million, nine hundred five thousand, nine hundred six".