525400420 has 24 divisors (see below), whose sum is σ = 1103873400. Its totient is φ = 210058752.

The previous prime is 525400411. The next prime is 525400429. The reversal of 525400420 is 24004525.

It is an interprime number because it is at equal distance from previous prime (525400411) and next prime (525400429).

It can be written as a sum of positive squares in 4 ways, for example, as 17438976 + 507961444 = 4176^2 + 22538^2 .

It is a junction number, because it is equal to n+sod(n) for n = 525400391 and 525400400.

It is not an unprimeable number, because it can be changed into a prime (525400429) 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, 47146 + ... + 57214.

It is an arithmetic number, because the mean of its divisors is an integer number (45994725).

Almost surely, 2^525400420 is an apocalyptic number.

It is an amenable number.

525400420 is an abundant number, since it is smaller than the sum of its proper divisors (578472980).

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

525400420 is a wasteful number, since it uses less digits than its factorization.

525400420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12687 (or 12685 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 525400420 is about 22921.6146900693. The cubic root of 525400420 is about 806.9193658439.

Adding to 525400420 its reverse (24004525), we get a palindrome (549404945).

The spelling of 525400420 in words is "five hundred twenty-five million, four hundred thousand, four hundred twenty".