999728413 has 2 divisors, whose sum is σ = 999728414. Its totient is φ = 999728412.

The previous prime is 999728381. The next prime is 999728417. The reversal of 999728413 is 314827999.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 921547449 + 78180964 = 30357^2 + 8842^2 .

It is a cyclic number.

It is not a de Polignac number, because 999728413 - 2⁵ = 999728381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999728417) 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, 499864206 + 499864207.

It is an arithmetic number, because the mean of its divisors is an integer number (499864207).

Almost surely, 2^999728413 is an apocalyptic number.

It is an amenable number.

999728413 is a deficient number, since it is larger than the sum of its proper divisors (1).

999728413 is an equidigital number, since it uses as much as digits as its factorization.

999728413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 999728413 is about 31618.4821425697. The cubic root of 999728413 is about 999.9094628033.

The spelling of 999728413 in words is "nine hundred ninety-nine million, seven hundred twenty-eight thousand, four hundred thirteen".