84040400840 has 32 divisors (see below), whose sum is σ = 206280984960. Its totient is φ = 30560145600.

The previous prime is 84040400839. The next prime is 84040400891. The reversal of 84040400840 is 4800404048.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 84040400797 and 84040400806.

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 7 ways as a sum of consecutive naturals, for example, 95500016 + ... + 95500895.

It is an arithmetic number, because the mean of its divisors is an integer number (6446280780).

Almost surely, 2^84040400840 is an apocalyptic number.

It is an amenable number.

84040400840 is an abundant number, since it is smaller than the sum of its proper divisors (122240584120).

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

84040400840 is a wasteful number, since it uses less digits than its factorization.

84040400840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191000933 (or 191000929 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

Adding to 84040400840 its reverse (4800404048), we get a palindrome (88840804888).

It can be divided in two parts, 840404008 and 40, that added together give a palindrome (840404048).

The spelling of 84040400840 in words is "eighty-four billion, forty million, four hundred thousand, eight hundred forty".