844936391309 has 4 divisors (see below), whose sum is σ = 845402951040. Its totient is φ = 844469831580.

The previous prime is 844936391291. The next prime is 844936391323. The reversal of 844936391309 is 903193639448.

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 844936391309 - 2⁸ = 844936391053 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 (844936391909) 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, 233277149 + ... + 233280770.

It is an arithmetic number, because the mean of its divisors is an integer number (211350737760).

Almost surely, 2^844936391309 is an apocalyptic number.

It is an amenable number.

844936391309 is a deficient number, since it is larger than the sum of its proper divisors (466559731).

844936391309 is a wasteful number, since it uses less digits than its factorization.

844936391309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466559730.

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 844936391309 in words is "eight hundred forty-four billion, nine hundred thirty-six million, three hundred ninety-one thousand, three hundred nine".