117821646 has 24 divisors (see below), whose sum is σ = 256005360. Its totient is φ = 39162336.

The previous prime is 117821629. The next prime is 117821647. The reversal of 117821646 is 646128711.

It is a happy number.

117821646 is a `hidden beast` number, since 1 + 1 + 7 + 8 + 2 + 1 + 646 = 666.

It is a super-2 number, since 2×117821646² = 27763880532298632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 117821646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117821647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2655 + ... + 15578.

It is an arithmetic number, because the mean of its divisors is an integer number (10666890).

Almost surely, 2^117821646 is an apocalyptic number.

117821646 is an abundant number, since it is smaller than the sum of its proper divisors (138183714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117821646 is a wasteful number, since it uses less digits than its factorization.

117821646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18600 (or 18597 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 117821646 is about 10854.5679785056. The cubic root of 117821646 is about 490.2395690935.

The spelling of 117821646 in words is "one hundred seventeen million, eight hundred twenty-one thousand, six hundred forty-six".