6446403 has 12 divisors (see below), whose sum is σ = 9380280. Its totient is φ = 4265856.

The previous prime is 6446387. The next prime is 6446413. The reversal of 6446403 is 3046446.

It is a happy number.

It is not a de Polignac number, because 6446403 - 2⁴ = 6446387 is a prime.

It is a super-2 number, since 2×6446403² = 83112223276818, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6446413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1326 + ... + 3827.

It is an arithmetic number, because the mean of its divisors is an integer number (781690).

Almost surely, 2^6446403 is an apocalyptic number.

6446403 is a deficient number, since it is larger than the sum of its proper divisors (2933877).

6446403 is a wasteful number, since it uses less digits than its factorization.

6446403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5298 (or 5295 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 6446403 is about 2538.9767623986. The cubic root of 6446403 is about 186.1111891554. Note that the first 4 decimals are identical.

The spelling of 6446403 in words is "six million, four hundred forty-six thousand, four hundred three".