1999988329 has 2 divisors, whose sum is σ = 1999988330. Its totient is φ = 1999988328.

The previous prime is 1999988293. The next prime is 1999988357. The reversal of 1999988329 is 9238899991.

Together with previous prime (1999988293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1546298329 + 453690000 = 39323^2 + 21300^2 .

It is an emirp because it is prime and its reverse (9238899991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1999988329 - 2¹¹ = 1999986281 is a prime.

It is a super-2 number, since 2×1999988329² = 7999906632272424482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1999988359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999994164 + 999994165.

It is an arithmetic number, because the mean of its divisors is an integer number (999994165).

Almost surely, 2^1999988329 is an apocalyptic number.

It is an amenable number.

1999988329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999988329 is an equidigital number, since it uses as much as digits as its factorization.

1999988329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22674816, while the sum is 67.

The square root of 1999988329 is about 44721.2290640586. The cubic root of 1999988329 is about 1259.9185991337.

The spelling of 1999988329 in words is "one billion, nine hundred ninety-nine million, nine hundred eighty-eight thousand, three hundred twenty-nine".