840100840 has 16 divisors (see below), whose sum is σ = 1890226980. Its totient is φ = 336040320.

The previous prime is 840100819. The next prime is 840100843. The reversal of 840100840 is 48001048.

840100840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 676312036 + 163788804 = 26006^2 + 12798^2 .

It is not an unprimeable number, because it can be changed into a prime (840100843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10501221 + ... + 10501300.

Almost surely, 2^840100840 is an apocalyptic number.

It is an amenable number.

840100840 is an abundant number, since it is smaller than the sum of its proper divisors (1050126140).

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

840100840 is a wasteful number, since it uses less digits than its factorization.

840100840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21002532 (or 21002528 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 840100840 is about 28984.4930954467. The cubic root of 840100840 is about 943.5765510812.

Adding to 840100840 its reverse (48001048), we get a palindrome (888101888).

It can be divided in two parts, 8401008 and 40, that added together give a palindrome (8401048).

The spelling of 840100840 in words is "eight hundred forty million, one hundred thousand, eight hundred forty".