1243620223 has 4 divisors (see below), whose sum is σ = 1244185920. Its totient is φ = 1243054528.

The previous prime is 1243620199. The next prime is 1243620239. The reversal of 1243620223 is 3220263421.

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 1243620223 - 2¹³ = 1243612031 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 (1243620293) 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, 279538 + ... + 283951.

It is an arithmetic number, because the mean of its divisors is an integer number (311046480).

Almost surely, 2^1243620223 is an apocalyptic number.

1243620223 is a deficient number, since it is larger than the sum of its proper divisors (565697).

1243620223 is an equidigital number, since it uses as much as digits as its factorization.

1243620223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565696.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1243620223 is about 35264.9999716433. Note that the first 4 decimals coincide. The cubic root of 1243620223 is about 1075.3815766020.

Adding to 1243620223 its reverse (3220263421), we get a palindrome (4463883644).

The spelling of 1243620223 in words is "one billion, two hundred forty-three million, six hundred twenty thousand, two hundred twenty-three".