1243220403 has 16 divisors (see below), whose sum is σ = 1746501120. Its totient is φ = 785076864.

The previous prime is 1243220383. The next prime is 1243220411. The reversal of 1243220403 is 3040223421.

It is not a de Polignac number, because 1243220403 - 2⁵ = 1243220371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1243220403.

It is not an unprimeable number, because it can be changed into a prime (1243220203) 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 15 ways as a sum of consecutive naturals, for example, 80358 + ... + 94571.

It is an arithmetic number, because the mean of its divisors is an integer number (109156320).

Almost surely, 2^1243220403 is an apocalyptic number.

1243220403 is a deficient number, since it is larger than the sum of its proper divisors (503280717).

1243220403 is a wasteful number, since it uses less digits than its factorization.

1243220403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175058.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 1243220403 is about 35259.3307225194. The cubic root of 1243220403 is about 1075.2663203153.

Adding to 1243220403 its reverse (3040223421), we get a palindrome (4283443824).

The spelling of 1243220403 in words is "one billion, two hundred forty-three million, two hundred twenty thousand, four hundred three".