399885746 has 8 divisors (see below), whose sum is σ = 645969324. Its totient is φ = 184562640.

The previous prime is 399885671. The next prime is 399885749. The reversal of 399885746 is 647588993.

It can be written as a sum of positive squares in 2 ways, for example, as 383572225 + 16313521 = 19585^2 + 4039^2 .

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

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 7690085 + ... + 7690136.

Almost surely, 2^399885746 is an apocalyptic number.

399885746 is a deficient number, since it is larger than the sum of its proper divisors (246083578).

399885746 is a wasteful number, since it uses less digits than its factorization.

399885746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380236.

The product of its digits is 13063680, while the sum is 59.

The square root of 399885746 is about 19997.1434460025. The cubic root of 399885746 is about 736.7361404919.

The spelling of 399885746 in words is "three hundred ninety-nine million, eight hundred eighty-five thousand, seven hundred forty-six".