840863 has 2 divisors, whose sum is σ = 840864. Its totient is φ = 840862.

The previous prime is 840859. The next prime is 840907. The reversal of 840863 is 368048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840863 - 2² = 840859 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420431 + 420432.

It is an arithmetic number, because the mean of its divisors is an integer number (420432).

2⁸⁴⁰⁸⁶³ is an apocalyptic number.

840863 is a deficient number, since it is larger than the sum of its proper divisors (1).

840863 is an equidigital number, since it uses as much as digits as its factorization.

840863 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 840863 is about 916.9858232274. The cubic root of 840863 is about 94.3861810065.

The spelling of 840863 in words is "eight hundred forty thousand, eight hundred sixty-three".