6446385 has 40 divisors (see below), whose sum is σ = 12614976. Its totient is φ = 3123360.

The previous prime is 6446353. The next prime is 6446387. The reversal of 6446385 is 5836446.

6446385 is a `hidden beast` number, since 644 + 6 + 3 + 8 + 5 = 666.

It is not a de Polignac number, because 6446385 - 2⁵ = 6446353 is a prime.

It is an Ulam number.

It is a Curzon number.

6446385 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6446387) 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 39 ways as a sum of consecutive naturals, for example, 3732 + ... + 5178.

Almost surely, 2^6446385 is an apocalyptic number.

It is an amenable number.

6446385 is a deficient number, since it is larger than the sum of its proper divisors (6168591).

6446385 is a wasteful number, since it uses less digits than its factorization.

6446385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475 (or 1466 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 6446385 is about 2538.9732176610. The cubic root of 6446385 is about 186.1110159319. Note that the first 3 decimals are identical.

The spelling of 6446385 in words is "six million, four hundred forty-six thousand, three hundred eighty-five".