635403 has 4 divisors (see below), whose sum is σ = 847208. Its totient is φ = 423600.

The previous prime is 635389. The next prime is 635413. The reversal of 635403 is 304536.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 635403 - 2⁴ = 635387 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 635403.

It is not an unprimeable number, because it can be changed into a prime (635413) 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, 105898 + ... + 105903.

It is an arithmetic number, because the mean of its divisors is an integer number (211802).

2⁶³⁵⁴⁰³ is an apocalyptic number.

635403 is a deficient number, since it is larger than the sum of its proper divisors (211805).

635403 is a wasteful number, since it uses less digits than its factorization.

635403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211804.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 635403 is about 797.1216971078. The cubic root of 635403 is about 85.9705596001.

Adding to 635403 its reverse (304536), we get a palindrome (939939).

The spelling of 635403 in words is "six hundred thirty-five thousand, four hundred three".