840707920 has 40 divisors (see below), whose sum is σ = 2105005896. Its totient is φ = 310414848.

The previous prime is 840707897. The next prime is 840707927. The reversal of 840707920 is 29707048.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 9193024 + 831514896 = 3032^2 + 28836^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 840707920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840707927) 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 7 ways as a sum of consecutive naturals, for example, 403147 + ... + 405226.

Almost surely, 2^840707920 is an apocalyptic number.

840707920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

840707920 is an abundant number, since it is smaller than the sum of its proper divisors (1264297976).

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

840707920 is a wasteful number, since it uses less digits than its factorization.

840707920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808399 (or 808393 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 840707920 is about 28994.9637006153. The cubic root of 840707920 is about 943.8037811551.

The spelling of 840707920 in words is "eight hundred forty million, seven hundred seven thousand, nine hundred twenty".