520749 has 12 divisors (see below), whose sum is σ = 780416. Its totient is φ = 347004.

The previous prime is 520747. The next prime is 520759. The reversal of 520749 is 947025.

It is not a de Polignac number, because 520749 - 2¹ = 520747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a nialpdrome in base 9.

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 520749.

It is not an unprimeable number, because it can be changed into a prime (520747) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 829 + ... + 1314.

2⁵²⁰⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

520749 is a deficient number, since it is larger than the sum of its proper divisors (259667).

520749 is an equidigital number, since it uses as much as digits as its factorization.

520749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2158 (or 2146 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 520749 is about 721.6294062744. The cubic root of 520749 is about 80.4531059260.

The spelling of 520749 in words is "five hundred twenty thousand, seven hundred forty-nine".