399567 has 16 divisors (see below), whose sum is σ = 622080. Its totient is φ = 223392.

The previous prime is 399557. The next prime is 399571. The reversal of 399567 is 765993.

It is not a de Polignac number, because 399567 - 2⁷ = 399439 is a prime.

399567 is a modest number, since divided by 567 gives 399 as remainder.

It is a zygodrome in base 2.

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 399567.

It is not an unprimeable number, because it can be changed into a prime (399527) 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, 934 + ... + 1292.

It is an arithmetic number, because the mean of its divisors is an integer number (38880).

2³⁹⁹⁵⁶⁷ is an apocalyptic number.

399567 is a deficient number, since it is larger than the sum of its proper divisors (222513).

399567 is a wasteful number, since it uses less digits than its factorization.

399567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422.

The product of its digits is 51030, while the sum is 39.

The square root of 399567 is about 632.1131227874. The cubic root of 399567 is about 73.6540339464.

The spelling of 399567 in words is "three hundred ninety-nine thousand, five hundred sixty-seven".