303 has 4 divisors (see below), whose sum is σ = 408. Its totient is φ = 200.

The previous prime is 293. The next prime is 307.

303 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 303 - 2⁵ = 271 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

303 is an undulating number in base 10.

303 is a lucky number.

It is a plaindrome in base 6, base 8, base 9, base 11, base 14 and base 16.

It is a junction number, because it is equal to n+sod(n) for n = 291 and 300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307) 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, 48 + ... + 53.

It is an arithmetic number, because the mean of its divisors is an integer number (102).

303 is a deficient number, since it is larger than the sum of its proper divisors (105).

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

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

The sum of its prime factors is 104.

The product of its (nonzero) digits is 9, while the sum is 6.

The square root of 303 is about 17.4068951855. The cubic root of 303 is about 6.7165699615.

It can be divided in two parts, 30 and 3, that added together give a palindrome (33).

The spelling of 303 in words is "three hundred three", and thus it is an aban number, an iban number, and an oban number.