399849719 has 2 divisors, whose sum is σ = 399849720. Its totient is φ = 399849718.

The previous prime is 399849701. The next prime is 399849833. The reversal of 399849719 is 917948993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399849719 - 2²⁸ = 131414263 is a prime.

It is a super-2 number, since 2×399849719² = 319759595568757922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399849019) 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, 199924859 + 199924860.

It is an arithmetic number, because the mean of its divisors is an integer number (199924860).

Almost surely, 2^399849719 is an apocalyptic number.

399849719 is a deficient number, since it is larger than the sum of its proper divisors (1).

399849719 is an equidigital number, since it uses as much as digits as its factorization.

399849719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 399849719 is about 19996.2426220528. The cubic root of 399849719 is about 736.7140148470.

The spelling of 399849719 in words is "three hundred ninety-nine million, eight hundred forty-nine thousand, seven hundred nineteen".