525206440 has 64 divisors (see below), whose sum is σ = 1292060160. Its totient is φ = 190552320.

The previous prime is 525206419. The next prime is 525206447. The reversal of 525206440 is 44602525.

It is a junction number, because it is equal to n+sod(n) for n = 525206399 and 525206408.

It is not an unprimeable number, because it can be changed into a prime (525206447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244009 + ... + 246151.

It is an arithmetic number, because the mean of its divisors is an integer number (20188440).

Almost surely, 2^525206440 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 525206440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646030080).

525206440 is an abundant number, since it is smaller than the sum of its proper divisors (766853720).

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

525206440 is a wasteful number, since it uses less digits than its factorization.

525206440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722 (or 2718 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 525206440 is about 22917.3829221401. The cubic root of 525206440 is about 806.8200476351.

Adding to 525206440 its reverse (44602525), we get a palindrome (569808965).

The spelling of 525206440 in words is "five hundred twenty-five million, two hundred six thousand, four hundred forty".