6445925 has 6 divisors (see below), whose sum is σ = 7992978. Its totient is φ = 5156720.

The previous prime is 6445919. The next prime is 6445937. The reversal of 6445925 is 5295446.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1256641 + 5189284 = 1121^2 + 2278^2 .

It is not a de Polignac number, because 6445925 - 2¹⁴ = 6429541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 128894 + ... + 128943.

It is an arithmetic number, because the mean of its divisors is an integer number (1332163).

Almost surely, 2^6445925 is an apocalyptic number.

It is an amenable number.

6445925 is a deficient number, since it is larger than the sum of its proper divisors (1547053).

6445925 is a wasteful number, since it uses less digits than its factorization.

6445925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257847 (or 257842 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 6445925 is about 2538.8826282442. The cubic root of 6445925 is about 186.1065890010.

The spelling of 6445925 in words is "six million, four hundred forty-five thousand, nine hundred twenty-five".