840770920 has 48 divisors (see below), whose sum is σ = 2079356580. Its totient is φ = 305733120.

The previous prime is 840770893. The next prime is 840770939. The reversal of 840770920 is 29077048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 816702084 + 24068836 = 28578^2 + 4906^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 840770920.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 82017 + ... + 91696.

Almost surely, 2^840770920 is an apocalyptic number.

It is an amenable number.

840770920 is an abundant number, since it is smaller than the sum of its proper divisors (1238585660).

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

840770920 is a wasteful number, since it uses less digits than its factorization.

840770920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173746 (or 173731 counting only the distinct ones).

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

The square root of 840770920 is about 28996.0500758293. The cubic root of 840770920 is about 943.8273557925.

The spelling of 840770920 in words is "eight hundred forty million, seven hundred seventy thousand, nine hundred twenty".