6446985 has 16 divisors (see below), whose sum is σ = 10858560. Its totient is φ = 3257280.

The previous prime is 6446981. The next prime is 6446987. The reversal of 6446985 is 5896446.

It is not a de Polignac number, because 6446985 - 2² = 6446981 is a prime.

It is a Curzon number.

6446985 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6446981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11026 + ... + 11595.

It is an arithmetic number, because the mean of its divisors is an integer number (678660).

Almost surely, 2^6446985 is an apocalyptic number.

It is an amenable number.

6446985 is a deficient number, since it is larger than the sum of its proper divisors (4411575).

6446985 is a wasteful number, since it uses less digits than its factorization.

6446985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22648.

The product of its digits is 207360, while the sum is 42.

The square root of 6446985 is about 2539.0913729128. The cubic root of 6446985 is about 186.1167898732.

The spelling of 6446985 in words is "six million, four hundred forty-six thousand, nine hundred eighty-five".