840040844 has 12 divisors (see below), whose sum is σ = 1547443800. Its totient is φ = 397914048.

The previous prime is 840040781. The next prime is 840040847. The reversal of 840040844 is 448040048.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 840040844.

It is not an unprimeable number, because it can be changed into a prime (840040847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5526509 + ... + 5526660.

It is an arithmetic number, because the mean of its divisors is an integer number (128953650).

Almost surely, 2^840040844 is an apocalyptic number.

It is an amenable number.

840040844 is a deficient number, since it is larger than the sum of its proper divisors (707402956).

840040844 is a wasteful number, since it uses less digits than its factorization.

840040844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11053192 (or 11053190 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 840040844 is about 28983.4581097563. The cubic root of 840040844 is about 943.5540886323.

The spelling of 840040844 in words is "eight hundred forty million, forty thousand, eight hundred forty-four".