1243784423 has 4 divisors (see below), whose sum is σ = 1421467920. Its totient is φ = 1066100928.

The previous prime is 1243784407. The next prime is 1243784483. The reversal of 1243784423 is 3244873421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3244873421 = 4339 ⋅747839.

It is a cyclic number.

It is not a de Polignac number, because 1243784423 - 2⁴ = 1243784407 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 (1243784483) 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, 88841738 + ... + 88841751.

It is an arithmetic number, because the mean of its divisors is an integer number (355366980).

Almost surely, 2^1243784423 is an apocalyptic number.

1243784423 is a deficient number, since it is larger than the sum of its proper divisors (177683497).

1243784423 is an equidigital number, since it uses as much as digits as its factorization.

1243784423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177683496.

The product of its digits is 129024, while the sum is 38.

The square root of 1243784423 is about 35267.3279821423. The cubic root of 1243784423 is about 1075.4289034522.

The spelling of 1243784423 in words is "one billion, two hundred forty-three million, seven hundred eighty-four thousand, four hundred twenty-three".