1213303 has 16 divisors (see below), whose sum is σ = 1523200. Its totient is φ = 940896.

The previous prime is 1213301. The next prime is 1213327. The reversal of 1213303 is 3033121.

It is a cyclic number.

It is not a de Polignac number, because 1213303 - 2¹ = 1213301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is the 1102-nd Hogben number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213301) by changing a digit.

It is a nontrivial repunit in base 1101.

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 15 ways as a sum of consecutive naturals, for example, 5998 + ... + 6196.

It is an arithmetic number, because the mean of its divisors is an integer number (95200).

2^1213303 is an apocalyptic number.

1213303 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1213303 is a deficient number, since it is larger than the sum of its proper divisors (309897).

1213303 is a wasteful number, since it uses less digits than its factorization.

1213303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 1213303 is about 1101.5003404448. The cubic root of 1213303 is about 106.6570965806.

Adding to 1213303 its reverse (3033121), we get a palindrome (4246424).

The spelling of 1213303 in words is "one million, two hundred thirteen thousand, three hundred three".