840457863 has 20 divisors (see below), whose sum is σ = 1434856720. Its totient is φ = 480261312.

The previous prime is 840457861. The next prime is 840457867. The reversal of 840457863 is 368754048.

It is not a de Polignac number, because 840457863 - 2¹ = 840457861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840457861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 740578 + ... + 741711.

It is an arithmetic number, because the mean of its divisors is an integer number (71742836).

Almost surely, 2^840457863 is an apocalyptic number.

840457863 is a deficient number, since it is larger than the sum of its proper divisors (594398857).

840457863 is a wasteful number, since it uses less digits than its factorization.

840457863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482308 (or 1482299 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The square root of 840457863 is about 28990.6513034806. The cubic root of 840457863 is about 943.7101980612.

The spelling of 840457863 in words is "eight hundred forty million, four hundred fifty-seven thousand, eight hundred sixty-three".