399885745 has 16 divisors (see below), whose sum is σ = 548904960. Its totient is φ = 273962304.

The previous prime is 399885671. The next prime is 399885749. The reversal of 399885745 is 547588993.

399885745 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 399885745 - 2¹⁵ = 399852977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399885745.

It is not an unprimeable number, because it can be changed into a prime (399885749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40299 + ... + 49231.

It is an arithmetic number, because the mean of its divisors is an integer number (34306560).

Almost surely, 2^399885745 is an apocalyptic number.

399885745 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

399885745 is a deficient number, since it is larger than the sum of its proper divisors (149019215).

399885745 is a wasteful number, since it uses less digits than its factorization.

399885745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10224.

The product of its digits is 10886400, while the sum is 58.

The square root of 399885745 is about 19997.1434209989. The cubic root of 399885745 is about 736.7361398777.

The spelling of 399885745 in words is "three hundred ninety-nine million, eight hundred eighty-five thousand, seven hundred forty-five".