840047423 has 4 divisors (see below), whose sum is σ = 876571248. Its totient is φ = 803523600.

The previous prime is 840047357. The next prime is 840047449. The reversal of 840047423 is 324740048.

840047423 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 840047423 - 2¹² = 840043327 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840047423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840047023) 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, 18261878 + ... + 18261923.

It is an arithmetic number, because the mean of its divisors is an integer number (219142812).

Almost surely, 2^840047423 is an apocalyptic number.

840047423 is a deficient number, since it is larger than the sum of its proper divisors (36523825).

840047423 is a wasteful number, since it uses less digits than its factorization.

840047423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36523824.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 840047423 is about 28983.5716053077. The cubic root of 840047423 is about 943.5565518563.

The spelling of 840047423 in words is "eight hundred forty million, forty-seven thousand, four hundred twenty-three".