399447 has 6 divisors (see below), whose sum is σ = 576992. Its totient is φ = 266292.

The previous prime is 399439. The next prime is 399473. The reversal of 399447 is 744993.

It is not a de Polignac number, because 399447 - 2³ = 399439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 399447.

It is not an unprimeable number, because it can be changed into a prime (399647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22183 + ... + 22200.

2³⁹⁹⁴⁴⁷ is an apocalyptic number.

399447 is a deficient number, since it is larger than the sum of its proper divisors (177545).

399447 is a wasteful number, since it uses less digits than its factorization.

399447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44389 (or 44386 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 399447 is about 632.0181959406. The cubic root of 399447 is about 73.6466598231.

The spelling of 399447 in words is "three hundred ninety-nine thousand, four hundred forty-seven".