840909856 has 24 divisors (see below), whose sum is σ = 1656622800. Its totient is φ = 420180288.

The previous prime is 840909851. The next prime is 840909859. The reversal of 840909856 is 658909048.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (840909851) 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 3 ways as a sum of consecutive naturals, for example, 46635 + ... + 62101.

It is an arithmetic number, because the mean of its divisors is an integer number (69025950).

Almost surely, 2^840909856 is an apocalyptic number.

It is an amenable number.

840909856 is a deficient number, since it is larger than the sum of its proper divisors (815712944).

840909856 is a wasteful number, since it uses less digits than its factorization.

840909856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17176 (or 17168 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 49.

The square root of 840909856 is about 28998.4457514536. The cubic root of 840909856 is about 943.8793415641.

The spelling of 840909856 in words is "eight hundred forty million, nine hundred nine thousand, eight hundred fifty-six".