525440 has 32 divisors (see below), whose sum is σ = 1257660. Its totient is φ = 209920.

The previous prime is 525439. The next prime is 525457. The reversal of 525440 is 44525.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 506944 + 18496 = 712^2 + 136^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 1050.

2⁵²⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628830).

525440 is an abundant number, since it is smaller than the sum of its proper divisors (732220).

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

525440 is an equidigital number, since it uses as much as digits as its factorization.

525440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 525440 is about 724.8724025648. The cubic root of 525440 is about 80.6939627893.

Adding to 525440 its reverse (44525), we get a palindrome (569965).

The spelling of 525440 in words is "five hundred twenty-five thousand, four hundred forty".