19443877139 has 2 divisors, whose sum is σ = 19443877140. Its totient is φ = 19443877138.

The previous prime is 19443877121. The next prime is 19443877147. The reversal of 19443877139 is 93177834491.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19443877139 - 2²⁰ = 19442828563 is a prime.

It is not a weakly prime, because it can be changed into another prime (19443867139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721938569 + 9721938570.

It is an arithmetic number, because the mean of its divisors is an integer number (9721938570).

Almost surely, 2^19443877139 is an apocalyptic number.

19443877139 is a deficient number, since it is larger than the sum of its proper divisors (1).

19443877139 is an equidigital number, since it uses as much as digits as its factorization.

19443877139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 56.

The spelling of 19443877139 in words is "nineteen billion, four hundred forty-three million, eight hundred seventy-seven thousand, one hundred thirty-nine".