399696 has 40 divisors (see below), whose sum is σ = 1127904. Its totient is φ = 120960.

The previous prime is 399691. The next prime is 399719. The reversal of 399696 is 696993.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399691) by changing a digit.

399696 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, 150 + ... + 906.

2³⁹⁹⁶⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (563952).

399696 is an abundant number, since it is smaller than the sum of its proper divisors (728208).

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

399696 is a wasteful number, since it uses less digits than its factorization.

399696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779 (or 773 counting only the distinct ones).

The product of its digits is 78732, while the sum is 42.

The square root of 399696 is about 632.2151532509. The cubic root of 399696 is about 73.6619594826.

It can be divided in two parts, 3 and 99696, that added together give a palindrome (99699).

The spelling of 399696 in words is "three hundred ninety-nine thousand, six hundred ninety-six".