1685863 has 2 divisors, whose sum is σ = 1685864. Its totient is φ = 1685862.

The previous prime is 1685861. The next prime is 1685869. The reversal of 1685863 is 3685861.

It is a weak prime.

It is an emirp because it is prime and its reverse (3685861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1685863 - 2¹ = 1685861 is a prime.

Together with 1685861, it forms a pair of twin primes.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842931 + 842932.

It is an arithmetic number, because the mean of its divisors is an integer number (842932).

2^1685863 is an apocalyptic number.

1685863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685863 is an equidigital number, since it uses as much as digits as its factorization.

1685863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 1685863 is about 1298.4078712023. The cubic root of 1685863 is about 119.0165690273.

The spelling of 1685863 in words is "one million, six hundred eighty-five thousand, eight hundred sixty-three".