19397878879 has 2 divisors, whose sum is σ = 19397878880. Its totient is φ = 19397878878.

The previous prime is 19397878859. The next prime is 19397878949. The reversal of 19397878879 is 97887879391.

It is a weak prime.

It is an emirp because it is prime and its reverse (97887879391) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19397878879 - 2¹¹ = 19397876831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19397878859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9698939439 + 9698939440.

It is an arithmetic number, because the mean of its divisors is an integer number (9698939440).

Almost surely, 2^19397878879 is an apocalyptic number.

19397878879 is a deficient number, since it is larger than the sum of its proper divisors (1).

19397878879 is an equidigital number, since it uses as much as digits as its factorization.

19397878879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384072192, while the sum is 76.

The spelling of 19397878879 in words is "nineteen billion, three hundred ninety-seven million, eight hundred seventy-eight thousand, eight hundred seventy-nine".