399441 has 16 divisors (see below), whose sum is σ = 635904. Its totient is φ = 218064.

The previous prime is 399439. The next prime is 399473. The reversal of 399441 is 144993.

It is not a de Polignac number, because 399441 - 2¹ = 399439 is a prime.

It is a super-2 number, since 2×399441² = 319106224962, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 399399 and 399408.

It is not an unprimeable number, because it can be changed into a prime (399401) 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 15 ways as a sum of consecutive naturals, for example, 70 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (39744).

2³⁹⁹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

399441 is a deficient number, since it is larger than the sum of its proper divisors (236463).

399441 is a wasteful number, since it uses less digits than its factorization.

399441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

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

The square root of 399441 is about 632.0134492240. The cubic root of 399441 is about 73.6462910782.

The spelling of 399441 in words is "three hundred ninety-nine thousand, four hundred forty-one".