840086836 has 12 divisors (see below), whose sum is σ = 1501432128. Its totient is φ = 411106232.

The previous prime is 840086831. The next prime is 840086837. The reversal of 840086836 is 638680048.

It is a junction number, because it is equal to n+sod(n) for n = 840086792 and 840086801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840086831) 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 3 ways as a sum of consecutive naturals, for example, 2234086 + ... + 2234461.

It is an arithmetic number, because the mean of its divisors is an integer number (125119344).

Almost surely, 2^840086836 is an apocalyptic number.

It is an amenable number.

840086836 is a deficient number, since it is larger than the sum of its proper divisors (661345292).

840086836 is a wasteful number, since it uses less digits than its factorization.

840086836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468598 (or 4468596 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 840086836 is about 28984.2515169876. The cubic root of 840086836 is about 943.5713080918.

The spelling of 840086836 in words is "eight hundred forty million, eighty-six thousand, eight hundred thirty-six".