399593 has 4 divisors (see below), whose sum is σ = 400980. Its totient is φ = 398208.

The previous prime is 399587. The next prime is 399601. The reversal of 399593 is 395993.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 29929 = 608^2 + 173^2 .

It is a cyclic number.

It is not a de Polignac number, because 399593 - 2⁴ = 399577 is a prime.

It is a Duffinian number.

It is a congruent 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, 80 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (100245).

2³⁹⁹⁵⁹³ is an apocalyptic number.

It is an amenable number.

399593 is a deficient number, since it is larger than the sum of its proper divisors (1387).

399593 is an equidigital number, since it uses as much as digits as its factorization.

399593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386.

The product of its digits is 32805, while the sum is 38.

The square root of 399593 is about 632.1336883919. The cubic root of 399593 is about 73.6556314786.

Subtracting from 399593 its reverse (395993), we obtain a square (3600 = 60²).

The spelling of 399593 in words is "three hundred ninety-nine thousand, five hundred ninety-three".