399612 has 12 divisors (see below), whose sum is σ = 932456. Its totient is φ = 133200.

The previous prime is 399601. The next prime is 399613. The reversal of 399612 is 216993.

Added to its reverse (216993) it gives a triangular number (616605 = T₁₁₁₀).

399612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 399612.

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 399612.

It is not an unprimeable number, because it can be changed into a prime (399613) by changing a digit.

399612 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, 16639 + ... + 16662.

2³⁹⁹⁶¹² is an apocalyptic number.

It is an amenable number.

399612 is an abundant number, since it is smaller than the sum of its proper divisors (532844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399612 is a wasteful number, since it uses less digits than its factorization.

399612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33308 (or 33306 counting only the distinct ones).

The product of its digits is 2916, while the sum is 30.

The square root of 399612 is about 632.1487166799. The cubic root of 399612 is about 73.6567988621.

Adding to 399612 its reverse (216993), we get a triangular number (616605 = T₁₁₁₀).

The spelling of 399612 in words is "three hundred ninety-nine thousand, six hundred twelve".