1243020223 has 4 divisors (see below), whose sum is σ = 1308442360. Its totient is φ = 1177598088.

The previous prime is 1243020209. The next prime is 1243020239. The reversal of 1243020223 is 3220203421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3220203421 = 59 ⋅54579719.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243020223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 65422117 = 1243020223 / (1 + 2 + 4 + 3 + 0 + 2 + 0 + 2 + 2 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1243020223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243020203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32711040 + ... + 32711077.

It is an arithmetic number, because the mean of its divisors is an integer number (327110590).

Almost surely, 2^1243020223 is an apocalyptic number.

1243020223 is a deficient number, since it is larger than the sum of its proper divisors (65422137).

1243020223 is an equidigital number, since it uses as much as digits as its factorization.

1243020223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65422136.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 1243020223 is about 35256.4919270196. The cubic root of 1243020223 is about 1075.2086050554.

Adding to 1243020223 its reverse (3220203421), we get a palindrome (4463223644).

The spelling of 1243020223 in words is "one billion, two hundred forty-three million, twenty thousand, two hundred twenty-three".