1999924859 has 2 divisors, whose sum is σ = 1999924860. Its totient is φ = 1999924858.

The previous prime is 1999924853. The next prime is 1999924873. The reversal of 1999924859 is 9584299991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999924859 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1999924795 and 1999924804.

It is not a weakly prime, because it can be changed into another prime (1999924853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999962429 + 999962430.

It is an arithmetic number, because the mean of its divisors is an integer number (999962430).

Almost surely, 2^1999924859 is an apocalyptic number.

1999924859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999924859 is an equidigital number, since it uses as much as digits as its factorization.

1999924859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 65.

The square root of 1999924859 is about 44720.5194401854. The cubic root of 1999924859 is about 1259.9052710760.

The spelling of 1999924859 in words is "one billion, nine hundred ninety-nine million, nine hundred twenty-four thousand, eight hundred fifty-nine".