399459 has 4 divisors (see below), whose sum is σ = 532616. Its totient is φ = 266304.

The previous prime is 399439. The next prime is 399473. The reversal of 399459 is 954993.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 399459 - 2¹⁶ = 333923 is a prime.

It is a D-number.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399409) 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, 66574 + ... + 66579.

It is an arithmetic number, because the mean of its divisors is an integer number (133154).

2³⁹⁹⁴⁵⁹ is an apocalyptic number.

399459 is a deficient number, since it is larger than the sum of its proper divisors (133157).

399459 is a wasteful number, since it uses less digits than its factorization.

399459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133156.

The product of its digits is 43740, while the sum is 39.

The square root of 399459 is about 632.0276892669. The cubic root of 399459 is about 73.6473973019.

It can be divided in two parts, 399 and 459, that added together give a palindrome (858).

The spelling of 399459 in words is "three hundred ninety-nine thousand, four hundred fifty-nine".