399396 has 24 divisors (see below), whose sum is σ = 945504. Its totient is φ = 131200.

The previous prime is 399391. The next prime is 399401. The reversal of 399396 is 693993.

It is an interprime number because it is at equal distance from previous prime (399391) and next prime (399401).

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

399396 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 796 + ... + 1196.

It is an arithmetic number, because the mean of its divisors is an integer number (39396).

2³⁹⁹³⁹⁶ is an apocalyptic number.

It is an amenable number.

399396 is an abundant number, since it is smaller than the sum of its proper divisors (546108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399396 is a wasteful number, since it uses less digits than its factorization.

399396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 489 counting only the distinct ones).

The product of its digits is 39366, while the sum is 39.

The square root of 399396 is about 631.9778477130. The cubic root of 399396 is about 73.6435253735.

It can be divided in two parts, 3 and 99396, that added together give a palindrome (99399).

The spelling of 399396 in words is "three hundred ninety-nine thousand, three hundred ninety-six".