399384971 has 8 divisors (see below), whose sum is σ = 406338144. Its totient is φ = 392472000.

The previous prime is 399384943. The next prime is 399385001. The reversal of 399384971 is 179483993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399384971 - 2¹⁸ = 399122827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399384941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10346 + ... + 30096.

It is an arithmetic number, because the mean of its divisors is an integer number (50792268).

Almost surely, 2^399384971 is an apocalyptic number.

399384971 is a deficient number, since it is larger than the sum of its proper divisors (6953173).

399384971 is a wasteful number, since it uses less digits than its factorization.

399384971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20101.

The product of its digits is 1469664, while the sum is 53.

The square root of 399384971 is about 19984.6183601289. The cubic root of 399384971 is about 736.4284749828.

The spelling of 399384971 in words is "three hundred ninety-nine million, three hundred eighty-four thousand, nine hundred seventy-one".