823280399 has 2 divisors, whose sum is σ = 823280400. Its totient is φ = 823280398.

The previous prime is 823280351. The next prime is 823280413. The reversal of 823280399 is 993082328.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 823280399 - 2²⁸ = 554844943 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823280309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411640199 + 411640200.

It is an arithmetic number, because the mean of its divisors is an integer number (411640200).

Almost surely, 2^823280399 is an apocalyptic number.

823280399 is a deficient number, since it is larger than the sum of its proper divisors (1).

823280399 is an equidigital number, since it uses as much as digits as its factorization.

823280399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 823280399 is about 28692.8632067279. The cubic root of 823280399 is about 937.2366403121.

The spelling of 823280399 in words is "eight hundred twenty-three million, two hundred eighty thousand, three hundred ninety-nine".