999689729 has 2 divisors, whose sum is σ = 999689730. Its totient is φ = 999689728.

The previous prime is 999689683. The next prime is 999689759. The reversal of 999689729 is 927986999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 884170225 + 115519504 = 29735^2 + 10748^2 .

It is a cyclic number.

It is not a de Polignac number, because 999689729 - 2⁸ = 999689473 is a prime.

It is a super-3 number, since 3×999689729³ (a number of 28 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (999689759) 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, 499844864 + 499844865.

It is an arithmetic number, because the mean of its divisors is an integer number (499844865).

Almost surely, 2^999689729 is an apocalyptic number.

It is an amenable number.

999689729 is a deficient number, since it is larger than the sum of its proper divisors (1).

999689729 is an equidigital number, since it uses as much as digits as its factorization.

999689729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39680928, while the sum is 68.

The square root of 999689729 is about 31617.8704058322. The cubic root of 999689729 is about 999.8965656350.

The spelling of 999689729 in words is "nine hundred ninety-nine million, six hundred eighty-nine thousand, seven hundred twenty-nine".