686863 has 2 divisors, whose sum is σ = 686864. Its totient is φ = 686862.

The previous prime is 686843. The next prime is 686879. The reversal of 686863 is 368686.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686863 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 (686843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343431 + 343432.

It is an arithmetic number, because the mean of its divisors is an integer number (343432).

2⁶⁸⁶⁸⁶³ is an apocalyptic number.

686863 is a deficient number, since it is larger than the sum of its proper divisors (1).

686863 is an equidigital number, since it uses as much as digits as its factorization.

686863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 686863 is about 828.7719831172. The cubic root of 686863 is about 88.2314413917.

The spelling of 686863 in words is "six hundred eighty-six thousand, eight hundred sixty-three".