399489 has 16 divisors (see below), whose sum is σ = 565440. Its totient is φ = 250560.

The previous prime is 399481. The next prime is 399491. The reversal of 399489 is 984993.

It is not a de Polignac number, because 399489 - 2³ = 399481 is a prime.

It is a super-2 number, since 2×399489² = 319182922242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399489.

It is not an unprimeable number, because it can be changed into a prime (399481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6519 + ... + 6579.

It is an arithmetic number, because the mean of its divisors is an integer number (35340).

2³⁹⁹⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

399489 is a deficient number, since it is larger than the sum of its proper divisors (165951).

399489 is a wasteful number, since it uses less digits than its factorization.

399489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160.

The product of its digits is 69984, while the sum is 42.

The square root of 399489 is about 632.0514219587. The cubic root of 399489 is about 73.6492409342.

It can be divided in two parts, 399 and 489, that added together give a palindrome (888).

The spelling of 399489 in words is "three hundred ninety-nine thousand, four hundred eighty-nine".