840408084400 has 60 divisors (see below), whose sum is σ = 2019175166800. Its totient is φ = 336147459840.

The previous prime is 840408084317. The next prime is 840408084401. The reversal of 840408084400 is 4480804048.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (840408084401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12429886 + ... + 12497314.

Almost surely, 2^840408084400 is an apocalyptic number.

840408084400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

840408084400 is an abundant number, since it is smaller than the sum of its proper divisors (1178767082400).

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

840408084400 is a wasteful number, since it uses less digits than its factorization.

840408084400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98606 (or 98595 counting only the distinct ones).

The product of its (nonzero) digits is 131072, while the sum is 40.

Adding to 840408084400 its reverse (4480804048), we get a palindrome (844888888448).

The spelling of 840408084400 in words is "eight hundred forty billion, four hundred eight million, eighty-four thousand, four hundred".