12784017839 has 2 divisors, whose sum is σ = 12784017840. Its totient is φ = 12784017838.

The previous prime is 12784017767. The next prime is 12784017847. The reversal of 12784017839 is 93871048721.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12784017839 - 2²⁰ = 12782969263 is a prime.

It is a super-2 number, since 2×12784017839² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12784017859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392008919 + 6392008920.

It is an arithmetic number, because the mean of its divisors is an integer number (6392008920).

Almost surely, 2^12784017839 is an apocalyptic number.

12784017839 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784017839 is an equidigital number, since it uses as much as digits as its factorization.

12784017839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The spelling of 12784017839 in words is "twelve billion, seven hundred eighty-four million, seventeen thousand, eight hundred thirty-nine".