1998765829 has 2 divisors, whose sum is σ = 1998765830. Its totient is φ = 1998765828.

The previous prime is 1998765823. The next prime is 1998765841. The reversal of 1998765829 is 9285678991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1998268804 + 497025 = 44702^2 + 705^2 .

It is an emirp because it is prime and its reverse (9285678991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1998765829 - 2¹³ = 1998757637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998765823) 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, 999382914 + 999382915.

It is an arithmetic number, because the mean of its divisors is an integer number (999382915).

Almost surely, 2^1998765829 is an apocalyptic number.

It is an amenable number.

1998765829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998765829 is an equidigital number, since it uses as much as digits as its factorization.

1998765829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 64.

The square root of 1998765829 is about 44707.5589693734. The cubic root of 1998765829 is about 1259.6618368984.

The spelling of 1998765829 in words is "one billion, nine hundred ninety-eight million, seven hundred sixty-five thousand, eight hundred twenty-nine".