840040804 has 6 divisors (see below), whose sum is σ = 1470071414. Its totient is φ = 420020400.

The previous prime is 840040781. The next prime is 840040847. The reversal of 840040804 is 408040048.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 838218304 + 1822500 = 28952^2 + 1350^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105005097 + ... + 105005104.

Almost surely, 2^840040804 is an apocalyptic number.

It is an amenable number.

840040804 is a deficient number, since it is larger than the sum of its proper divisors (630030610).

840040804 is a wasteful number, since it uses less digits than its factorization.

840040804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210010205 (or 210010203 counting only the distinct ones).

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

The square root of 840040804 is about 28983.4574197075. The cubic root of 840040804 is about 943.5540736560.

The spelling of 840040804 in words is "eight hundred forty million, forty thousand, eight hundred four".