1265443423 has 4 divisors (see below), whose sum is σ = 1289319768. Its totient is φ = 1241567080.

The previous prime is 1265443411. The next prime is 1265443429. The reversal of 1265443423 is 3243445621.

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 1265443423 - 2²⁵ = 1231888991 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 (1265443429) 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, 11938093 + ... + 11938198.

It is an arithmetic number, because the mean of its divisors is an integer number (322329942).

Almost surely, 2^1265443423 is an apocalyptic number.

1265443423 is a deficient number, since it is larger than the sum of its proper divisors (23876345).

1265443423 is an equidigital number, since it uses as much as digits as its factorization.

1265443423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23876344.

The product of its digits is 69120, while the sum is 34.

The square root of 1265443423 is about 35573.0715991746. The cubic root of 1265443423 is about 1081.6354460022.

The spelling of 1265443423 in words is "one billion, two hundred sixty-five million, four hundred forty-three thousand, four hundred twenty-three".