84004840 has 16 divisors (see below), whose sum is σ = 189010980. Its totient is φ = 33601920.

The previous prime is 84004829. The next prime is 84004847. The reversal of 84004840 is 4840048.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81108036 + 2896804 = 9006^2 + 1702^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84004799 and 84004808.

It is not an unprimeable number, because it can be changed into a prime (84004847) 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, 1050021 + ... + 1050100.

Almost surely, 2^84004840 is an apocalyptic number.

It is an amenable number.

84004840 is an abundant number, since it is smaller than the sum of its proper divisors (105006140).

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

84004840 is a wasteful number, since it uses less digits than its factorization.

84004840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100132 (or 2100128 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 28.

The square root of 84004840 is about 9165.4154297555. The cubic root of 84004840 is about 437.9603252846.

Adding to 84004840 its reverse (4840048), we get a palindrome (88844888).

The spelling of 84004840 in words is "eighty-four million, four thousand, eight hundred forty".