840459863 has 2 divisors, whose sum is σ = 840459864. Its totient is φ = 840459862.

The previous prime is 840459857. The next prime is 840459883. The reversal of 840459863 is 368954048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840459863 - 2¹⁶ = 840394327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840459803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420229931 + 420229932.

It is an arithmetic number, because the mean of its divisors is an integer number (420229932).

Almost surely, 2^840459863 is an apocalyptic number.

840459863 is a deficient number, since it is larger than the sum of its proper divisors (1).

840459863 is an equidigital number, since it uses as much as digits as its factorization.

840459863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 840459863 is about 28990.6857973384. The cubic root of 840459863 is about 943.7109466289.

The spelling of 840459863 in words is "eight hundred forty million, four hundred fifty-nine thousand, eight hundred sixty-three".