399388 has 24 divisors (see below), whose sum is σ = 791280. Its totient is φ = 174720.

The previous prime is 399379. The next prime is 399389. The reversal of 399388 is 883993.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 399388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399389) by changing a digit.

399388 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1120 + ... + 1432.

It is an arithmetic number, because the mean of its divisors is an integer number (32970).

2³⁹⁹³⁸⁸ is an apocalyptic number.

It is an amenable number.

399388 is a deficient number, since it is larger than the sum of its proper divisors (391892).

399388 is a wasteful number, since it uses less digits than its factorization.

399388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 355 counting only the distinct ones).

The product of its digits is 46656, while the sum is 40.

The square root of 399388 is about 631.9715183456. The cubic root of 399388 is about 73.6430336709.

It can be divided in two parts, 399 and 388, that added together give a palindrome (787).

The spelling of 399388 in words is "three hundred ninety-nine thousand, three hundred eighty-eight".