1999799959 has 2 divisors, whose sum is σ = 1999799960. Its totient is φ = 1999799958.

The previous prime is 1999799941. The next prime is 1999800031. The reversal of 1999799959 is 9599979991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999799959 - 2⁵ = 1999799927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999799909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999899979 + 999899980.

It is an arithmetic number, because the mean of its divisors is an integer number (999899980).

Almost surely, 2^1999799959 is an apocalyptic number.

1999799959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999799959 is an equidigital number, since it uses as much as digits as its factorization.

1999799959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 167403915, while the sum is 76.

The square root of 1999799959 is about 44719.1229676969. The cubic root of 1999799959 is about 1259.8790425165.

The spelling of 1999799959 in words is "one billion, nine hundred ninety-nine million, seven hundred ninety-nine thousand, nine hundred fifty-nine".