399168041 has 4 divisors (see below), whose sum is σ = 422648532. Its totient is φ = 375687552.

The previous prime is 399168037. The next prime is 399168053. The reversal of 399168041 is 140861993.

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 347039641 + 52128400 = 18629^2 + 7220^2 .

It is a cyclic number.

It is not a de Polignac number, because 399168041 - 2² = 399168037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 399168041.

It is not an unprimeable number, because it can be changed into a prime (399168241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11740220 + ... + 11740253.

It is an arithmetic number, because the mean of its divisors is an integer number (105662133).

Almost surely, 2^399168041 is an apocalyptic number.

It is an amenable number.

399168041 is a deficient number, since it is larger than the sum of its proper divisors (23480491).

399168041 is a wasteful number, since it uses less digits than its factorization.

399168041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23480490.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 399168041 is about 19979.1901988044. The cubic root of 399168041 is about 736.2951179686.

The spelling of 399168041 in words is "three hundred ninety-nine million, one hundred sixty-eight thousand, forty-one".