1223503999 has 4 divisors (see below), whose sum is σ = 1224853864. Its totient is φ = 1222154136.

The previous prime is 1223503979. The next prime is 1223504011. The reversal of 1223503999 is 9993053221.

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 1223503999 - 2¹⁵ = 1223471231 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 (1223503979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 673572 + ... + 675385.

It is an arithmetic number, because the mean of its divisors is an integer number (306213466).

Almost surely, 2^1223503999 is an apocalyptic number.

1223503999 is a deficient number, since it is larger than the sum of its proper divisors (1349865).

1223503999 is an equidigital number, since it uses as much as digits as its factorization.

1223503999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349864.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 1223503999 is about 34978.6220283190. The cubic root of 1223503999 is about 1069.5517378741.

The spelling of 1223503999 in words is "one billion, two hundred twenty-three million, five hundred three thousand, nine hundred ninety-nine".