840006817 has 16 divisors (see below), whose sum is σ = 916090560. Its totient is φ = 765611712.

The previous prime is 840006781. The next prime is 840006821. The reversal of 840006817 is 718600048.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 840006817 - 2⁷ = 840006689 is a prime.

It is a super-2 number, since 2×840006817² = 1411222905212942978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840006877) 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 15 ways as a sum of consecutive naturals, for example, 518034 + ... + 519652.

It is an arithmetic number, because the mean of its divisors is an integer number (57255660).

Almost surely, 2^840006817 is an apocalyptic number.

It is an amenable number.

840006817 is a deficient number, since it is larger than the sum of its proper divisors (76083743).

840006817 is a wasteful number, since it uses less digits than its factorization.

840006817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 840006817 is about 28982.8710965632. The cubic root of 840006817 is about 943.5413484786.

The spelling of 840006817 in words is "eight hundred forty million, six thousand, eight hundred seventeen".