840660481 has 4 divisors (see below), whose sum is σ = 852176452. Its totient is φ = 829144512.

The previous prime is 840660467. The next prime is 840660493. The reversal of 840660481 is 184066048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 320410000 + 520250481 = 17900^2 + 22809^2 .

It is not a de Polignac number, because 840660481 - 2²⁹ = 303789569 is a prime.

It is a super-2 number, since 2×840660481² = 1413420088630302722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840660481.

It is not an unprimeable number, because it can be changed into a prime (840660181) 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, 5757876 + ... + 5758021.

It is an arithmetic number, because the mean of its divisors is an integer number (213044113).

Almost surely, 2^840660481 is an apocalyptic number.

It is an amenable number.

840660481 is a deficient number, since it is larger than the sum of its proper divisors (11515971).

840660481 is a wasteful number, since it uses less digits than its factorization.

840660481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11515970.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 840660481 is about 28994.1456332136. The cubic root of 840660481 is about 943.7860286759.

The spelling of 840660481 in words is "eight hundred forty million, six hundred sixty thousand, four hundred eighty-one".