399658 has 8 divisors (see below), whose sum is σ = 685152. Its totient is φ = 171276.

The previous prime is 399647. The next prime is 399667. The reversal of 399658 is 856993.

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

It is a d-powerful number, because it can be written as 3⁷ + 9² + 6⁷ + 9⁴ + 5⁷ + 8⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 399658.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14260 + ... + 14287.

It is an arithmetic number, because the mean of its divisors is an integer number (85644).

2³⁹⁹⁶⁵⁸ is an apocalyptic number.

399658 is a deficient number, since it is larger than the sum of its proper divisors (285494).

399658 is a wasteful number, since it uses less digits than its factorization.

399658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28556.

The product of its digits is 58320, while the sum is 40.

The square root of 399658 is about 632.1850994764. The cubic root of 399658 is about 73.6596250057.

The spelling of 399658 in words is "three hundred ninety-nine thousand, six hundred fifty-eight".