840866905 has 16 divisors (see below), whose sum is σ = 1017792000. Its totient is φ = 666878400.

The previous prime is 840866899. The next prime is 840866911. The reversal of 840866905 is 509668048.

840866905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (840866899) and next prime (840866911).

It is not a de Polignac number, because 840866905 - 2²¹ = 838769753 is a prime.

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, 542071 + ... + 543619.

It is an arithmetic number, because the mean of its divisors is an integer number (63612000).

Almost surely, 2^840866905 is an apocalyptic number.

It is an amenable number.

840866905 is a deficient number, since it is larger than the sum of its proper divisors (176925095).

840866905 is a wasteful number, since it uses less digits than its factorization.

840866905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 840866905 is about 28997.7051678232. The cubic root of 840866905 is about 943.8632711726.

The spelling of 840866905 in words is "eight hundred forty million, eight hundred sixty-six thousand, nine hundred five".