399688 has 16 divisors (see below), whose sum is σ = 766080. Its totient is φ = 195408.

The previous prime is 399677. The next prime is 399689. The reversal of 399688 is 886993.

It is not an unprimeable number, because it can be changed into a prime (399689) by changing a digit.

399688 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 3 ways as a sum of consecutive naturals, for example, 156 + ... + 907.

It is an arithmetic number, because the mean of its divisors is an integer number (47880).

2³⁹⁹⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

399688 is a deficient number, since it is larger than the sum of its proper divisors (366392).

399688 is a wasteful number, since it uses less digits than its factorization.

399688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116 (or 1112 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 399688 is about 632.2088262592. The cubic root of 399688 is about 73.6614680260.

The spelling of 399688 in words is "three hundred ninety-nine thousand, six hundred eighty-eight".