399206 has 4 divisors (see below), whose sum is σ = 598812. Its totient is φ = 199602.

The previous prime is 399197. The next prime is 399221. The reversal of 399206 is 602993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 602993 = 131 ⋅4603.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399206.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99800 + ... + 99803.

It is an arithmetic number, because the mean of its divisors is an integer number (149703).

2³⁹⁹²⁰⁶ is an apocalyptic number.

399206 is a deficient number, since it is larger than the sum of its proper divisors (199606).

399206 is a wasteful number, since it uses less digits than its factorization.

399206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199605.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 399206 is about 631.8275081064. The cubic root of 399206 is about 73.6318456628.

The spelling of 399206 in words is "three hundred ninety-nine thousand, two hundred six".