663398 has 8 divisors (see below), whose sum is σ = 998760. Its totient is φ = 330480.

The previous prime is 663371. The next prime is 663407. The reversal of 663398 is 893366.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

663398 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (124845).

2⁶⁶³³⁹⁸ is an apocalyptic number.

663398 is a deficient number, since it is larger than the sum of its proper divisors (335362).

663398 is a wasteful number, since it uses less digits than its factorization.

663398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222.

The product of its digits is 23328, while the sum is 35.

The square root of 663398 is about 814.4924800144. The cubic root of 663398 is about 87.2150403314.

The spelling of 663398 in words is "six hundred sixty-three thousand, three hundred ninety-eight".