399381447 has 16 divisors (see below), whose sum is σ = 543902688. Its totient is φ = 260582400.

The previous prime is 399381421. The next prime is 399381469. The reversal of 399381447 is 744183993.

It is a happy number.

It is not a de Polignac number, because 399381447 - 2¹⁶ = 399315911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399381396 and 399381405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399381247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65947 + ... + 71747.

It is an arithmetic number, because the mean of its divisors is an integer number (33993918).

Almost surely, 2^399381447 is an apocalyptic number.

399381447 is a deficient number, since it is larger than the sum of its proper divisors (144521241).

399381447 is a wasteful number, since it uses less digits than its factorization.

399381447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6290.

The product of its digits is 653184, while the sum is 48.

The square root of 399381447 is about 19984.5301921261. The cubic root of 399381447 is about 736.4263090011.

The spelling of 399381447 in words is "three hundred ninety-nine million, three hundred eighty-one thousand, four hundred forty-seven".