1203720503 has 4 divisors (see below), whose sum is σ = 1223453688. Its totient is φ = 1183987320.

The previous prime is 1203720491. The next prime is 1203720523. The reversal of 1203720503 is 3050273021.

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 1203720503 - 2⁸ = 1203720247 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 (1203720523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9866501 + ... + 9866622.

It is an arithmetic number, because the mean of its divisors is an integer number (305863422).

Almost surely, 2^1203720503 is an apocalyptic number.

1203720503 is a deficient number, since it is larger than the sum of its proper divisors (19733185).

1203720503 is an equidigital number, since it uses as much as digits as its factorization.

1203720503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19733184.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 1203720503 is about 34694.6754272179. The cubic root of 1203720503 is about 1063.7556651420.

Adding to 1203720503 its reverse (3050273021), we get a palindrome (4253993524).

The spelling of 1203720503 in words is "one billion, two hundred three million, seven hundred twenty thousand, five hundred three".