1213503 has 16 divisors (see below), whose sum is σ = 1731840. Its totient is φ = 753984.

The previous prime is 1213483. The next prime is 1213517. The reversal of 1213503 is 3053121.

It is a happy number.

It is not a de Polignac number, because 1213503 - 2⁶ = 1213439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2763 + ... + 3171.

It is an arithmetic number, because the mean of its divisors is an integer number (108240).

2^1213503 is an apocalyptic number.

1213503 is a deficient number, since it is larger than the sum of its proper divisors (518337).

1213503 is a wasteful number, since it uses less digits than its factorization.

1213503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 1213503 is about 1101.5911219686. The cubic root of 1213503 is about 106.6629566852.

Adding to 1213503 its reverse (3053121), we get a palindrome (4266624).

The spelling of 1213503 in words is "one million, two hundred thirteen thousand, five hundred three".