999328397 has 2 divisors, whose sum is σ = 999328398. Its totient is φ = 999328396.

The previous prime is 999328373. The next prime is 999328399. The reversal of 999328397 is 793823999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844425481 + 154902916 = 29059^2 + 12446^2 .

It is an emirp because it is prime and its reverse (793823999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999328397 - 2⁶ = 999328333 is a prime.

Together with 999328399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999328399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499664198 + 499664199.

It is an arithmetic number, because the mean of its divisors is an integer number (499664199).

Almost surely, 2^999328397 is an apocalyptic number.

It is an amenable number.

999328397 is a deficient number, since it is larger than the sum of its proper divisors (1).

999328397 is an equidigital number, since it uses as much as digits as its factorization.

999328397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6613488, while the sum is 59.

The square root of 999328397 is about 31612.1558423338. The cubic root of 999328397 is about 999.7760821979.

The spelling of 999328397 in words is "nine hundred ninety-nine million, three hundred twenty-eight thousand, three hundred ninety-seven".