840438843 has 16 divisors (see below), whose sum is σ = 1188135936. Its totient is φ = 526608000.

The previous prime is 840438803. The next prime is 840438871. The reversal of 840438843 is 348834048.

It is not a de Polignac number, because 840438843 - 2¹³ = 840430651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840438795 and 840438804.

It is not an unprimeable number, because it can be changed into a prime (840438803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27330 + ... + 49272.

It is an arithmetic number, because the mean of its divisors is an integer number (74258496).

Almost surely, 2^840438843 is an apocalyptic number.

840438843 is a deficient number, since it is larger than the sum of its proper divisors (347697093).

840438843 is a wasteful number, since it uses less digits than its factorization.

840438843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22714.

The product of its (nonzero) digits is 294912, while the sum is 42.

The square root of 840438843 is about 28990.3232648413. The cubic root of 840438843 is about 943.7030791227.

The spelling of 840438843 in words is "eight hundred forty million, four hundred thirty-eight thousand, eight hundred forty-three".