840043339 has 4 divisors (see below), whose sum is σ = 851550856. Its totient is φ = 828535824.

The previous prime is 840043327. The next prime is 840043381. The reversal of 840043339 is 933340048.

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 840043339 - 2¹¹ = 840041291 is a prime.

It is a super-2 number, since 2×840043339² = 1411345622796537842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840043439) 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, 5753649 + ... + 5753794.

It is an arithmetic number, because the mean of its divisors is an integer number (212887714).

Almost surely, 2^840043339 is an apocalyptic number.

840043339 is a deficient number, since it is larger than the sum of its proper divisors (11507517).

840043339 is a wasteful number, since it uses less digits than its factorization.

840043339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11507516.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 840043339 is about 28983.5011515172. The cubic root of 840043339 is about 943.5550227794. Note that the first 3 decimals are identical.

The spelling of 840043339 in words is "eight hundred forty million, forty-three thousand, three hundred thirty-nine".