6446990 has 64 divisors (see below), whose sum is σ = 13685760. Its totient is φ = 2163840.

The previous prime is 6446987. The next prime is 6447017. The reversal of 6446990 is 996446.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 137147 + ... + 137193.

It is an arithmetic number, because the mean of its divisors is an integer number (213840).

Almost surely, 2^6446990 is an apocalyptic number.

6446990 is an abundant number, since it is smaller than the sum of its proper divisors (7238770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6446990 is a wasteful number, since it uses less digits than its factorization.

6446990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 6446990 is about 2539.0923575168. The cubic root of 6446990 is about 186.1168379878.

The spelling of 6446990 in words is "six million, four hundred forty-six thousand, nine hundred ninety".