840668408 has 32 divisors (see below), whose sum is σ = 1587936000. Its totient is φ = 417232512.

The previous prime is 840668383. The next prime is 840668449. The reversal of 840668408 is 804866048.

840668408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772841 + ... + 773927.

It is an arithmetic number, because the mean of its divisors is an integer number (49623000).

Almost surely, 2^840668408 is an apocalyptic number.

It is an amenable number.

840668408 is a deficient number, since it is larger than the sum of its proper divisors (747267592).

840668408 is a wasteful number, since it uses less digits than its factorization.

840668408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1719 (or 1715 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 44.

The square root of 840668408 is about 28994.2823329014. The cubic root of 840668408 is about 943.7889951403.

The spelling of 840668408 in words is "eight hundred forty million, six hundred sixty-eight thousand, four hundred eight".