863899 has 2 divisors, whose sum is σ = 863900. Its totient is φ = 863898.

The previous prime is 863897. The next prime is 863909. The reversal of 863899 is 998368.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 863899 - 2¹ = 863897 is a prime.

Together with 863897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (863897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431949 + 431950.

It is an arithmetic number, because the mean of its divisors is an integer number (431950).

2⁸⁶³⁸⁹⁹ is an apocalyptic number.

863899 is a deficient number, since it is larger than the sum of its proper divisors (1).

863899 is an equidigital number, since it uses as much as digits as its factorization.

863899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 863899 is about 929.4616721522. The cubic root of 863899 is about 95.2403516886.

The spelling of 863899 in words is "eight hundred sixty-three thousand, eight hundred ninety-nine".