840400000004 has 6 divisors (see below), whose sum is σ = 1470700000014. Its totient is φ = 420200000000.

The previous prime is 840399999997. The next prime is 840400000009. The reversal of 840400000004 is 400000004048.

It can be written as a sum of positive squares in only one way, i.e., 529259160004 + 311140840000 = 727502^2 + 557800^2 .

It is not an unprimeable number, because it can be changed into a prime (840400000009) by changing a digit.

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 as a sum of consecutive naturals, namely, 105049999997 + ... + 105050000004.

It is an arithmetic number, because the mean of its divisors is an integer number (245116666669).

Almost surely, 2^840400000004 is an apocalyptic number.

It is an amenable number.

840400000004 is a deficient number, since it is larger than the sum of its proper divisors (630300000010).

840400000004 is a wasteful number, since it uses less digits than its factorization.

840400000004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210100000005 (or 210100000003 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The spelling of 840400000004 in words is "eight hundred forty billion, four hundred million, four", and thus it is an aban number.