6404525 has 6 divisors (see below), whose sum is σ = 7941642. Its totient is φ = 5123600.

The previous prime is 6404521. The next prime is 6404527. The reversal of 6404525 is 5254046.

It can be written as a sum of positive squares in 3 ways, for example, as 1901641 + 4502884 = 1379^2 + 2122^2 .

It is not a de Polignac number, because 6404525 - 2² = 6404521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6404494 and 6404503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128066 + ... + 128115.

It is an arithmetic number, because the mean of its divisors is an integer number (1323607).

Almost surely, 2^6404525 is an apocalyptic number.

It is an amenable number.

6404525 is a deficient number, since it is larger than the sum of its proper divisors (1537117).

6404525 is a wasteful number, since it uses less digits than its factorization.

6404525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256191 (or 256186 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 6404525 is about 2530.7163017612. The cubic root of 6404525 is about 185.7072996809.

The spelling of 6404525 in words is "six million, four hundred four thousand, five hundred twenty-five".