840934656 has 144 divisors (see below), whose sum is σ = 2516572800. Its totient is φ = 276959232.

The previous prime is 840934643. The next prime is 840934667. The reversal of 840934656 is 656439048.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614485 + ... + 615851.

It is an arithmetic number, because the mean of its divisors is an integer number (17476200).

Almost surely, 2^840934656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840934656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1258286400).

840934656 is an abundant number, since it is smaller than the sum of its proper divisors (1675638144).

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

840934656 is a wasteful number, since it uses less digits than its factorization.

840934656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 1461 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 840934656 is about 28998.8733574255. The cubic root of 840934656 is about 943.8886203936. Note that the first 3 decimals are identical.

The spelling of 840934656 in words is "eight hundred forty million, nine hundred thirty-four thousand, six hundred fifty-six".