19899984239 has 2 divisors, whose sum is σ = 19899984240. Its totient is φ = 19899984238.

The previous prime is 19899984197. The next prime is 19899984263. The reversal of 19899984239 is 93248999891.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19899984239 - 2²⁰ = 19898935663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19899984289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9949992119 + 9949992120.

It is an arithmetic number, because the mean of its divisors is an integer number (9949992120).

Almost surely, 2^19899984239 is an apocalyptic number.

19899984239 is a deficient number, since it is larger than the sum of its proper divisors (1).

19899984239 is an equidigital number, since it uses as much as digits as its factorization.

19899984239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90699264, while the sum is 71.

The spelling of 19899984239 in words is "nineteen billion, eight hundred ninety-nine million, nine hundred eighty-four thousand, two hundred thirty-nine".