399946 has 8 divisors (see below), whose sum is σ = 602784. Its totient is φ = 199020.

The previous prime is 399941. The next prime is 399953. The reversal of 399946 is 649993.

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

It is a junction number, because it is equal to n+sod(n) for n = 399899 and 399908.

It is not an unprimeable number, because it can be changed into a prime (399941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301 + ... + 943.

It is an arithmetic number, because the mean of its divisors is an integer number (75348).

2³⁹⁹⁹⁴⁶ is an apocalyptic number.

399946 is a deficient number, since it is larger than the sum of its proper divisors (202838).

399946 is a wasteful number, since it uses less digits than its factorization.

399946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956.

The product of its digits is 52488, while the sum is 40.

The square root of 399946 is about 632.4128398444. The cubic root of 399946 is about 73.6773141952.

Subtracting 399946 from its reverse (649993), we obtain a cube (250047 = 63³).

It can be divided in two parts, 39994 and 6, that added together give a square (40000 = 200²).

The spelling of 399946 in words is "three hundred ninety-nine thousand, nine hundred forty-six".