6443825 has 12 divisors (see below), whose sum is σ = 8064588. Its totient is φ = 5107200.

The previous prime is 6443797. The next prime is 6443837. The reversal of 6443825 is 5283446.

It can be written as a sum of positive squares in 6 ways, for example, as 1056784 + 5387041 = 1028^2 + 2321^2 .

It is not a de Polignac number, because 6443825 - 2¹⁰ = 6442801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6443791 and 6443800.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1685 + ... + 3965.

It is an arithmetic number, because the mean of its divisors is an integer number (672049).

Almost surely, 2^6443825 is an apocalyptic number.

It is an amenable number.

6443825 is a deficient number, since it is larger than the sum of its proper divisors (1620763).

6443825 is a wasteful number, since it uses less digits than its factorization.

6443825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404 (or 2399 counting only the distinct ones).

The product of its digits is 23040, while the sum is 32.

The square root of 6443825 is about 2538.4690267955. The cubic root of 6443825 is about 186.0863764229.

The spelling of 6443825 in words is "six million, four hundred forty-three thousand, eight hundred twenty-five".