399143506 has 8 divisors (see below), whose sum is σ = 599028300. Its totient is φ = 199467408.

The previous prime is 399143447. The next prime is 399143519. The reversal of 399143506 is 605341993.

It can be written as a sum of positive squares in 2 ways, for example, as 384512881 + 14630625 = 19609^2 + 3825^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47301 + ... + 55096.

Almost surely, 2^399143506 is an apocalyptic number.

399143506 is a deficient number, since it is larger than the sum of its proper divisors (199884794).

399143506 is a wasteful number, since it uses less digits than its factorization.

399143506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104348.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 399143506 is about 19978.5761754936. The cubic root of 399143506 is about 736.2800321159.

The spelling of 399143506 in words is "three hundred ninety-nine million, one hundred forty-three thousand, five hundred six".