1243315439 has 4 divisors (see below), whose sum is σ = 1297372656. Its totient is φ = 1189258224.

The previous prime is 1243315433. The next prime is 1243315441. The reversal of 1243315439 is 9345133421.

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 1243315439 - 2¹² = 1243311343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243315399 and 1243315408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243315433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27028574 + ... + 27028619.

It is an arithmetic number, because the mean of its divisors is an integer number (324343164).

Almost surely, 2^1243315439 is an apocalyptic number.

1243315439 is a deficient number, since it is larger than the sum of its proper divisors (54057217).

1243315439 is an equidigital number, since it uses as much as digits as its factorization.

1243315439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54057216.

The product of its digits is 38880, while the sum is 35.

The square root of 1243315439 is about 35260.6783684035. The cubic root of 1243315439 is about 1075.2937186232.

It can be divided in two parts, 12433 and 15439, that added together give a palindrome (27872).

The spelling of 1243315439 in words is "one billion, two hundred forty-three million, three hundred fifteen thousand, four hundred thirty-nine".