520440 has 32 divisors (see below), whose sum is σ = 1561680. Its totient is φ = 138752.

The previous prime is 520433. The next prime is 520447. The reversal of 520440 is 44025.

It is an interprime number because it is at equal distance from previous prime (520433) and next prime (520447).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a nialpdrome in base 15.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049 + ... + 2288.

2⁵²⁰⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

520440 is an abundant number, since it is smaller than the sum of its proper divisors (1041240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520440 is a wasteful number, since it uses less digits than its factorization.

520440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351 (or 4347 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 520440 is about 721.4152756908. The cubic root of 520440 is about 80.4371897947.

Adding to 520440 its reverse (44025), we get a palindrome (564465).

The spelling of 520440 in words is "five hundred twenty thousand, four hundred forty".