399443947 has 8 divisors (see below), whose sum is σ = 460774656. Its totient is φ = 339180072.

The previous prime is 399443923. The next prime is 399443969. The reversal of 399443947 is 749344993.

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

It is not a de Polignac number, because 399443947 - 2²³ = 391055339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399443894 and 399443903.

It is not an unprimeable number, because it can be changed into a prime (399440947) 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 in 7 ways as a sum of consecutive naturals, for example, 265903 + ... + 267400.

It is an arithmetic number, because the mean of its divisors is an integer number (57596832).

Almost surely, 2^399443947 is an apocalyptic number.

399443947 is a deficient number, since it is larger than the sum of its proper divisors (61330709).

399443947 is a wasteful number, since it uses less digits than its factorization.

399443947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533417.

The product of its digits is 2939328, while the sum is 52.

The square root of 399443947 is about 19986.0938404682. The cubic root of 399443947 is about 736.4647219385.

The spelling of 399443947 in words is "three hundred ninety-nine million, four hundred forty-three thousand, nine hundred forty-seven".