399144 has 16 divisors (see below), whose sum is σ = 997920. Its totient is φ = 133040.

The previous prime is 399137. The next prime is 399149. The reversal of 399144 is 441993.

399144 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (399149) 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, 8292 + ... + 8339.

It is an arithmetic number, because the mean of its divisors is an integer number (62370).

2³⁹⁹¹⁴⁴ is an apocalyptic number.

It is an amenable number.

399144 is an abundant number, since it is smaller than the sum of its proper divisors (598776).

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

399144 is a wasteful number, since it uses less digits than its factorization.

399144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16640 (or 16636 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 399144 is about 631.7784421773. The cubic root of 399144 is about 73.6280335868.

Subtracting 399144 from its reverse (441993), we obtain a square (42849 = 207²).

The spelling of 399144 in words is "three hundred ninety-nine thousand, one hundred forty-four".