1999996879 has 2 divisors, whose sum is σ = 1999996880. Its totient is φ = 1999996878.

The previous prime is 1999996871. The next prime is 1999996897. The reversal of 1999996879 is 9786999991.

Together with next prime (1999996897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999996879 - 2³ = 1999996871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999996871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999998439 + 999998440.

It is an arithmetic number, because the mean of its divisors is an integer number (999998440).

Almost surely, 2^1999996879 is an apocalyptic number.

1999996879 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999996879 is an equidigital number, since it uses as much as digits as its factorization.

1999996879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 178564176, while the sum is 76.

The square root of 1999996879 is about 44721.3246561414. The cubic root of 1999996879 is about 1259.9203945256.

The spelling of 1999996879 in words is "one billion, nine hundred ninety-nine million, nine hundred ninety-six thousand, eight hundred seventy-nine".