399168493 has 16 divisors (see below), whose sum is σ = 423346176. Its totient is φ = 375822720.

The previous prime is 399168487. The next prime is 399168521. The reversal of 399168493 is 394861993.

It is a cyclic number.

It is not a de Polignac number, because 399168493 - 2¹³ = 399160301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399168493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399168403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207705 + ... + 209617.

It is an arithmetic number, because the mean of its divisors is an integer number (26459136).

Almost surely, 2^399168493 is an apocalyptic number.

It is an amenable number.

399168493 is a deficient number, since it is larger than the sum of its proper divisors (24177683).

399168493 is a wasteful number, since it uses less digits than its factorization.

399168493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2124.

The product of its digits is 1259712, while the sum is 52.

The square root of 399168493 is about 19979.2015105709. The cubic root of 399168493 is about 736.2953958844.

The spelling of 399168493 in words is "three hundred ninety-nine million, one hundred sixty-eight thousand, four hundred ninety-three".