1999734787 has 2 divisors, whose sum is σ = 1999734788. Its totient is φ = 1999734786.

The previous prime is 1999734727. The next prime is 1999734791. The reversal of 1999734787 is 7874379991.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999734787 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999734727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999867393 + 999867394.

It is an arithmetic number, because the mean of its divisors is an integer number (999867394).

Almost surely, 2^1999734787 is an apocalyptic number.

1999734787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999734787 is an equidigital number, since it uses as much as digits as its factorization.

1999734787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24004512, while the sum is 64.

The square root of 1999734787 is about 44718.3942802064. The cubic root of 1999734787 is about 1259.8653561928.

The spelling of 1999734787 in words is "one billion, nine hundred ninety-nine million, seven hundred thirty-four thousand, seven hundred eighty-seven".