663403 has 4 divisors (see below), whose sum is σ = 714448. Its totient is φ = 612360.

The previous prime is 663371. The next prime is 663407. The reversal of 663403 is 304366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304366 = 2 ⋅152183.

It is a cyclic number.

It is not a de Polignac number, because 663403 - 2⁵ = 663371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663407) 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, 25503 + ... + 25528.

It is an arithmetic number, because the mean of its divisors is an integer number (178612).

2⁶⁶³⁴⁰³ is an apocalyptic number.

663403 is a deficient number, since it is larger than the sum of its proper divisors (51045).

663403 is a wasteful number, since it uses less digits than its factorization.

663403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51044.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 663403 is about 814.4955494047. The cubic root of 663403 is about 87.2152594427.

Adding to 663403 its reverse (304366), we get a palindrome (967769).

The spelling of 663403 in words is "six hundred sixty-three thousand, four hundred three".