999968399 has 2 divisors, whose sum is σ = 999968400. Its totient is φ = 999968398.

The previous prime is 999968341. The next prime is 999968429. The reversal of 999968399 is 993869999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999968399 - 2⁸ = 999968143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999968329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499984199 + 499984200.

It is an arithmetic number, because the mean of its divisors is an integer number (499984200).

Almost surely, 2^999968399 is an apocalyptic number.

999968399 is a deficient number, since it is larger than the sum of its proper divisors (1).

999968399 is an equidigital number, since it uses as much as digits as its factorization.

999968399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76527504, while the sum is 71.

The square root of 999968399 is about 31622.2769420546. The cubic root of 999968399 is about 999.9894662224.

The spelling of 999968399 in words is "nine hundred ninety-nine million, nine hundred sixty-eight thousand, three hundred ninety-nine".