840724243 has 4 divisors (see below), whose sum is σ = 842202360. Its totient is φ = 839246128.

The previous prime is 840724193. The next prime is 840724253. The reversal of 840724243 is 342427048.

840724243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840724243 - 2²⁹ = 303853331 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840724199 and 840724208.

It is not an unprimeable number, because it can be changed into a prime (840724253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 738205 + ... + 739342.

It is an arithmetic number, because the mean of its divisors is an integer number (210550590).

Almost surely, 2^840724243 is an apocalyptic number.

840724243 is a deficient number, since it is larger than the sum of its proper divisors (1478117).

840724243 is a wasteful number, since it uses less digits than its factorization.

840724243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478116.

The product of its (nonzero) digits is 43008, while the sum is 34.

The square root of 840724243 is about 28995.2451791669. The cubic root of 840724243 is about 943.8098893444.

The spelling of 840724243 in words is "eight hundred forty million, seven hundred twenty-four thousand, two hundred forty-three".