1220503 has 4 divisors (see below), whose sum is σ = 1284760. Its totient is φ = 1156248.

The previous prime is 1220497. The next prime is 1220507. The reversal of 1220503 is 3050221.

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 1220503 - 2⁹ = 1219991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32100 + ... + 32137.

It is an arithmetic number, because the mean of its divisors is an integer number (321190).

2^1220503 is an apocalyptic number.

1220503 is a deficient number, since it is larger than the sum of its proper divisors (64257).

1220503 is an equidigital number, since it uses as much as digits as its factorization.

1220503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64256.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 1220503 is about 1104.7637756552. The cubic root of 1220503 is about 106.8676559823.

Adding to 1220503 its reverse (3050221), we get a palindrome (4270724).

The spelling of 1220503 in words is "one million, two hundred twenty thousand, five hundred three".