520397 has 4 divisors (see below), whose sum is σ = 537216. Its totient is φ = 503580.

The previous prime is 520393. The next prime is 520409. The reversal of 520397 is 793025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520397 - 2² = 520393 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 (520393) 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, 8363 + ... + 8424.

It is an arithmetic number, because the mean of its divisors is an integer number (134304).

2⁵²⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

520397 is a deficient number, since it is larger than the sum of its proper divisors (16819).

520397 is a wasteful number, since it uses less digits than its factorization.

520397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16818.

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 520397 is about 721.3854725457. The cubic root of 520397 is about 80.4349744292.

It can be divided in two parts, 5 and 20397, that added together give a palindrome (20402).

The spelling of 520397 in words is "five hundred twenty thousand, three hundred ninety-seven".