399939359 has 2 divisors, whose sum is σ = 399939360. Its totient is φ = 399939358.

The previous prime is 399939329. The next prime is 399939373. The reversal of 399939359 is 953939993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399939359 - 2¹⁶ = 399873823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399939298 and 399939307.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399939329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199969679 + 199969680.

It is an arithmetic number, because the mean of its divisors is an integer number (199969680).

Almost surely, 2^399939359 is an apocalyptic number.

399939359 is a deficient number, since it is larger than the sum of its proper divisors (1).

399939359 is an equidigital number, since it uses as much as digits as its factorization.

399939359 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7971615, while the sum is 59.

The square root of 399939359 is about 19998.4839175373. The cubic root of 399939359 is about 736.7690639540.

The spelling of 399939359 in words is "three hundred ninety-nine million, nine hundred thirty-nine thousand, three hundred fifty-nine".