1306243693 has 4 divisors (see below), whose sum is σ = 1334036160. Its totient is φ = 1278451228.

The previous prime is 1306243681. The next prime is 1306243721. The reversal of 1306243693 is 3963426031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1306243693 - 2⁵ = 1306243661 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 (1306243633) 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, 13896163 + ... + 13896256.

It is an arithmetic number, because the mean of its divisors is an integer number (333509040).

Almost surely, 2^1306243693 is an apocalyptic number.

It is an amenable number.

1306243693 is a deficient number, since it is larger than the sum of its proper divisors (27792467).

1306243693 is an equidigital number, since it uses as much as digits as its factorization.

1306243693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27792466.

The product of its (nonzero) digits is 69984, while the sum is 37.

The square root of 1306243693 is about 36141.9934840346. The cubic root of 1306243693 is about 1093.1373553053.

The spelling of 1306243693 in words is "one billion, three hundred six million, two hundred forty-three thousand, six hundred ninety-three".