399398 has 12 divisors (see below), whose sum is σ = 637332. Its totient is φ = 187680.

The previous prime is 399391. The next prime is 399401. The reversal of 399398 is 893993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399391) by changing a digit.

399398 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 5 ways as a sum of consecutive naturals, for example, 233 + ... + 923.

It is an arithmetic number, because the mean of its divisors is an integer number (53111).

2³⁹⁹³⁹⁸ is an apocalyptic number.

399398 is a deficient number, since it is larger than the sum of its proper divisors (237934).

399398 is a wasteful number, since it uses less digits than its factorization.

399398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 710 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 399398 is about 631.9794300450. The cubic root of 399398 is about 73.6436482981.

It can be divided in two parts, 399 and 398, that added together give a palindrome (797).

The spelling of 399398 in words is "three hundred ninety-nine thousand, three hundred ninety-eight".