399563 has 4 divisors (see below), whose sum is σ = 410400. Its totient is φ = 388728.

The previous prime is 399557. The next prime is 399571. The reversal of 399563 is 365993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365993 = 17 ⋅21529.

It is a cyclic number.

It is not a de Polignac number, because 399563 - 2⁶ = 399499 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5363 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2³⁹⁹⁵⁶³ is an apocalyptic number.

399563 is a deficient number, since it is larger than the sum of its proper divisors (10837).

399563 is a wasteful number, since it uses less digits than its factorization.

399563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10836.

The product of its digits is 21870, while the sum is 35.

The square root of 399563 is about 632.1099587888. The cubic root of 399563 is about 73.6537881661.

The spelling of 399563 in words is "three hundred ninety-nine thousand, five hundred sixty-three".