663846 has 8 divisors (see below), whose sum is σ = 1327704. Its totient is φ = 221280.

The previous prime is 663827. The next prime is 663853. The reversal of 663846 is 648366.

It is a sphenic number, since it is the product of 3 distinct primes.

663846 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663846.

It is an unprimeable number.

663846 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55315 + ... + 55326.

It is an arithmetic number, because the mean of its divisors is an integer number (165963).

2⁶⁶³⁸⁴⁶ is an apocalyptic number.

663846 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663846 is a wasteful number, since it uses less digits than its factorization.

663846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110646.

The product of its digits is 20736, while the sum is 33.

The square root of 663846 is about 814.7674514854. The cubic root of 663846 is about 87.2346683405.

The spelling of 663846 in words is "six hundred sixty-three thousand, eight hundred forty-six".