19926877939 has 2 divisors, whose sum is σ = 19926877940. Its totient is φ = 19926877938.

The previous prime is 19926877849. The next prime is 19926878017. The reversal of 19926877939 is 93977862991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19926877939 is a prime.

It is not a weakly prime, because it can be changed into another prime (19926875939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9963438969 + 9963438970.

It is an arithmetic number, because the mean of its divisors is an integer number (9963438970).

Almost surely, 2^19926877939 is an apocalyptic number.

19926877939 is a deficient number, since it is larger than the sum of its proper divisors (1).

19926877939 is an equidigital number, since it uses as much as digits as its factorization.

19926877939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92588832, while the sum is 70.

The spelling of 19926877939 in words is "nineteen billion, nine hundred twenty-six million, eight hundred seventy-seven thousand, nine hundred thirty-nine".