399546505 has 4 divisors (see below), whose sum is σ = 479455812. Its totient is φ = 319637200.

The previous prime is 399546503. The next prime is 399546509. The reversal of 399546505 is 505645993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 309619216 + 89927289 = 17596^2 + 9483^2 .

It is not a de Polignac number, because 399546505 - 2¹ = 399546503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399546503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39954646 + ... + 39954655.

It is an arithmetic number, because the mean of its divisors is an integer number (119863953).

Almost surely, 2^399546505 is an apocalyptic number.

It is an amenable number.

399546505 is a deficient number, since it is larger than the sum of its proper divisors (79909307).

399546505 is an equidigital number, since it uses as much as digits as its factorization.

399546505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79909306.

The product of its (nonzero) digits is 729000, while the sum is 46.

The square root of 399546505 is about 19988.6594097753. The cubic root of 399546505 is about 736.5277461219.

The spelling of 399546505 in words is "three hundred ninety-nine million, five hundred forty-six thousand, five hundred five".