663389 has 4 divisors (see below), whose sum is σ = 692256. Its totient is φ = 634524.

The previous prime is 663371. The next prime is 663407. The reversal of 663389 is 983366.

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 an interprime number because it is at equal distance from previous prime (663371) and next prime (663407).

It is not a de Polignac number, because 663389 - 2¹⁶ = 597853 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 (663319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14399 + ... + 14444.

It is an arithmetic number, because the mean of its divisors is an integer number (173064).

2⁶⁶³³⁸⁹ is an apocalyptic number.

It is an amenable number.

663389 is a deficient number, since it is larger than the sum of its proper divisors (28867).

663389 is a wasteful number, since it uses less digits than its factorization.

663389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28866.

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

The square root of 663389 is about 814.4869550828. The cubic root of 663389 is about 87.2146459281.

The spelling of 663389 in words is "six hundred sixty-three thousand, three hundred eighty-nine".