663397 has 4 divisors (see below), whose sum is σ = 758176. Its totient is φ = 568620.

The previous prime is 663371. The next prime is 663407. The reversal of 663397 is 793366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663397 - 2⁷ = 663269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663097) by changing a digit.

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, 47379 + ... + 47392.

It is an arithmetic number, because the mean of its divisors is an integer number (189544).

2⁶⁶³³⁹⁷ is an apocalyptic number.

It is an amenable number.

663397 is a deficient number, since it is larger than the sum of its proper divisors (94779).

663397 is an equidigital number, since it uses as much as digits as its factorization.

663397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94778.

The product of its digits is 20412, while the sum is 34.

The square root of 663397 is about 814.4918661350. The cubic root of 663397 is about 87.2149965090.

The spelling of 663397 in words is "six hundred sixty-three thousand, three hundred ninety-seven".