999728417 has 2 divisors, whose sum is σ = 999728418. Its totient is φ = 999728416.

The previous prime is 999728413. The next prime is 999728423. The reversal of 999728417 is 714827999.

999728417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 775956736 + 223771681 = 27856^2 + 14959^2 .

It is a cyclic number.

It is not a de Polignac number, because 999728417 - 2² = 999728413 is a prime.

It is not a weakly prime, because it can be changed into another prime (999728413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499864208 + 499864209.

It is an arithmetic number, because the mean of its divisors is an integer number (499864209).

Almost surely, 2^999728417 is an apocalyptic number.

It is an amenable number.

999728417 is a deficient number, since it is larger than the sum of its proper divisors (1).

999728417 is an equidigital number, since it uses as much as digits as its factorization.

999728417 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 56.

The square root of 999728417 is about 31618.4822058239. The cubic root of 999728417 is about 999.9094641368.

The spelling of 999728417 in words is "nine hundred ninety-nine million, seven hundred twenty-eight thousand, four hundred seventeen".