525640 has 32 divisors (see below), whose sum is σ = 1253880. Its totient is φ = 197632.

The previous prime is 525607. The next prime is 525641. The reversal of 525640 is 46525.

525640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 367236 + 158404 = 606^2 + 398^2 .

It is not an unprimeable number, because it can be changed into a prime (525641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294 + ... + 1066.

2⁵²⁵⁶⁴⁰ 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 525640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (626940).

525640 is an abundant number, since it is smaller than the sum of its proper divisors (728240).

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

525640 is a wasteful number, since it uses less digits than its factorization.

525640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 525640 is about 725.0103447538. The cubic root of 525640 is about 80.7041997623.

The spelling of 525640 in words is "five hundred twenty-five thousand, six hundred forty".