399847 has 6 divisors (see below), whose sum is σ = 458888. Its totient is φ = 341292.

The previous prime is 399793. The next prime is 399851. The reversal of 399847 is 748993.

It is not a de Polignac number, because 399847 - 2⁷ = 399719 is a prime.

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 (399887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1554 + ... + 1792.

2³⁹⁹⁸⁴⁷ is an apocalyptic number.

399847 is a deficient number, since it is larger than the sum of its proper divisors (59041).

399847 is an frugal number, since it uses more digits than its factorization.

399847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 246 counting only the distinct ones).

The product of its digits is 54432, while the sum is 40.

The square root of 399847 is about 632.3345633444. The cubic root of 399847 is about 73.6712344945.

The spelling of 399847 in words is "three hundred ninety-nine thousand, eight hundred forty-seven".