399809106 has 24 divisors (see below), whose sum is σ = 874833804. Its totient is φ = 131949600.

The previous prime is 399809083. The next prime is 399809107. The reversal of 399809106 is 601908993.

It can be written as a sum of positive squares in 2 ways, for example, as 307476225 + 92332881 = 17535^2 + 9609^2 .

It is not an unprimeable number, because it can be changed into a prime (399809107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108141 + ... + 111776.

Almost surely, 2^399809106 is an apocalyptic number.

399809106 is an abundant number, since it is smaller than the sum of its proper divisors (475024698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399809106 is a wasteful number, since it uses less digits than its factorization.

399809106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220026 (or 220023 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 399809106 is about 19995.2270804810. The cubic root of 399809106 is about 736.6890711594.

The spelling of 399809106 in words is "three hundred ninety-nine million, eight hundred nine thousand, one hundred six".