840440808 has 24 divisors (see below), whose sum is σ = 2276194050. Its totient is φ = 280146912.

The previous prime is 840440807. The next prime is 840440827. The reversal of 840440808 is 808044048.

It can be written as a sum of positive squares in only one way, i.e., 598389444 + 242051364 = 24462^2 + 15558^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (840440803) 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 5 ways as a sum of consecutive naturals, for example, 5836323 + ... + 5836466.

Almost surely, 2^840440808 is an apocalyptic number.

It is an amenable number.

840440808 is an abundant number, since it is smaller than the sum of its proper divisors (1435753242).

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

840440808 is a wasteful number, since it uses less digits than its factorization.

840440808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672801 (or 11672794 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 840440808 is about 28990.3571554405. The cubic root of 840440808 is about 943.7038146016.

The spelling of 840440808 in words is "eight hundred forty million, four hundred forty thousand, eight hundred eight".