840908879540 has 48 divisors (see below), whose sum is σ = 1774633232064. Its totient is φ = 334702368000.

The previous prime is 840908879521. The next prime is 840908879557. The reversal of 840908879540 is 45978809048.

It is a super-2 number, since 2×840908879540² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24674192 + ... + 24708248.

It is an arithmetic number, because the mean of its divisors is an integer number (36971525668).

Almost surely, 2^840908879540 is an apocalyptic number.

It is an amenable number.

840908879540 is an abundant number, since it is smaller than the sum of its proper divisors (933724352524).

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

840908879540 is a wasteful number, since it uses less digits than its factorization.

840908879540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40128 (or 40126 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 62.

The spelling of 840908879540 in words is "eight hundred forty billion, nine hundred eight million, eight hundred seventy-nine thousand, five hundred forty".