6444425 has 24 divisors (see below), whose sum is σ = 8749440. Its totient is φ = 4680000.

The previous prime is 6444413. The next prime is 6444437. The reversal of 6444425 is 5244446.

It is a happy number.

6444425 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (6444413) and next prime (6444437).

It is not a de Polignac number, because 6444425 - 2⁸ = 6444169 is a prime.

It is a super-2 number, since 2×6444425² = 83061227161250, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6² + 4⁵ + 4⁵ + 4⁹ + 4¹¹ + 2¹⁵ + 5⁹ .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25550 + ... + 25800.

It is an arithmetic number, because the mean of its divisors is an integer number (364560).

Almost surely, 2^6444425 is an apocalyptic number.

6444425 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6444425 is a deficient number, since it is larger than the sum of its proper divisors (2305015).

6444425 is a wasteful number, since it uses less digits than its factorization.

6444425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 348 counting only the distinct ones).

The product of its digits is 15360, while the sum is 29.

The square root of 6444425 is about 2538.5872055141. The cubic root of 6444425 is about 186.0921518933.

The spelling of 6444425 in words is "six million, four hundred forty-four thousand, four hundred twenty-five".