840729343 has 4 divisors (see below), whose sum is σ = 869720040. Its totient is φ = 811738648.

The previous prime is 840729341. The next prime is 840729349. The reversal of 840729343 is 343927048.

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 840729343 - 2¹ = 840729341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840729296 and 840729305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840729341) 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, 14495305 + ... + 14495362.

It is an arithmetic number, because the mean of its divisors is an integer number (217430010).

Almost surely, 2^840729343 is an apocalyptic number.

840729343 is a deficient number, since it is larger than the sum of its proper divisors (28990697).

840729343 is a wasteful number, since it uses less digits than its factorization.

840729343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28990696.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 840729343 is about 28995.3331244875. Note that the first 3 decimals coincide. The cubic root of 840729343 is about 943.8117977866.

The spelling of 840729343 in words is "eight hundred forty million, seven hundred twenty-nine thousand, three hundred forty-three".