399889 has 6 divisors (see below), whose sum is σ = 465234. Its totient is φ = 342720.

The previous prime is 399887. The next prime is 399899. The reversal of 399889 is 988993.

It can be written as a sum of positive squares in only one way, i.e., 321489 + 78400 = 567^2 + 280^2 .

It is not a de Polignac number, because 399889 - 2¹ = 399887 is a prime.

It is a super-2 number, since 2×399889² = 319822424642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4032 + ... + 4129.

It is an arithmetic number, because the mean of its divisors is an integer number (77539).

2³⁹⁹⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

399889 is a deficient number, since it is larger than the sum of its proper divisors (65345).

399889 is an equidigital number, since it uses as much as digits as its factorization.

399889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8175 (or 8168 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 399889 is about 632.3677727399. The cubic root of 399889 is about 73.6738138840.

The spelling of 399889 in words is "three hundred ninety-nine thousand, eight hundred eighty-nine".