117947817 has 12 divisors (see below), whose sum is σ = 183474564. Its totient is φ = 72583200.

The previous prime is 117947813. The next prime is 117947833. The reversal of 117947817 is 718749711.

117947817 is a `hidden beast` number, since 1 + 179 + 478 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10949481 + 106998336 = 3309^2 + 10344^2 .

It is not a de Polignac number, because 117947817 - 2² = 117947813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (117947813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 503934 + ... + 504167.

It is an arithmetic number, because the mean of its divisors is an integer number (15289547).

Almost surely, 2^117947817 is an apocalyptic number.

It is an amenable number.

117947817 is a deficient number, since it is larger than the sum of its proper divisors (65526747).

117947817 is a wasteful number, since it uses less digits than its factorization.

117947817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008120 (or 1008117 counting only the distinct ones).

The product of its digits is 98784, while the sum is 45.

The square root of 117947817 is about 10860.3783083279. The cubic root of 117947817 is about 490.4145000246.

The spelling of 117947817 in words is "one hundred seventeen million, nine hundred forty-seven thousand, eight hundred seventeen".