2168399 has 2 divisors, whose sum is σ = 2168400. Its totient is φ = 2168398.

The previous prime is 2168377. The next prime is 2168407. The reversal of 2168399 is 9938612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2168399 - 2⁸ = 2168143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2168329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1084199 + 1084200.

It is an arithmetic number, because the mean of its divisors is an integer number (1084200).

2^2168399 is an apocalyptic number.

2168399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168399 is an equidigital number, since it uses as much as digits as its factorization.

2168399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 2168399 is about 1472.5484711886. The cubic root of 2168399 is about 129.4334118990.

The spelling of 2168399 in words is "two million, one hundred sixty-eight thousand, three hundred ninety-nine".