399958 has 8 divisors (see below), whose sum is σ = 646128. Its totient is φ = 184584.

The previous prime is 399953. The next prime is 399979. The reversal of 399958 is 859993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399953) by changing a digit.

399958 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 3 ways as a sum of consecutive naturals, for example, 7666 + ... + 7717.

It is an arithmetic number, because the mean of its divisors is an integer number (80766).

2³⁹⁹⁹⁵⁸ is an apocalyptic number.

399958 is a deficient number, since it is larger than the sum of its proper divisors (246170).

399958 is a wasteful number, since it uses less digits than its factorization.

399958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15398.

The product of its digits is 87480, while the sum is 43.

The square root of 399958 is about 632.4223272466. The cubic root of 399958 is about 73.6780510605.

The spelling of 399958 in words is "three hundred ninety-nine thousand, nine hundred fifty-eight".