6405625 has 20 divisors (see below), whose sum is σ = 8250484. Its totient is φ = 4968000.

The previous prime is 6405593. The next prime is 6405629. The reversal of 6405625 is 5265046.

It can be written as a sum of positive squares in 10 ways, for example, as 4652649 + 1752976 = 2157^2 + 1324^2 .

It is not a de Polignac number, because 6405625 - 2⁵ = 6405593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6405593 and 6405602.

It is not an unprimeable number, because it can be changed into a prime (6405629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 22987 + ... + 23263.

Almost surely, 2^6405625 is an apocalyptic number.

It is an amenable number.

6405625 is a deficient number, since it is larger than the sum of its proper divisors (1844859).

6405625 is an equidigital number, since it uses as much as digits as its factorization.

6405625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 6405625 is about 2530.9336222035. The cubic root of 6405625 is about 185.7179310358.

The spelling of 6405625 in words is "six million, four hundred five thousand, six hundred twenty-five".