6438986 has 16 divisors (see below), whose sum is σ = 10519200. Its totient is φ = 2944368.

The previous prime is 6438983. The next prime is 6438997. The reversal of 6438986 is 6898346.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6438983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820 + ... + 4023.

It is an arithmetic number, because the mean of its divisors is an integer number (657450).

Almost surely, 2^6438986 is an apocalyptic number.

6438986 is a deficient number, since it is larger than the sum of its proper divisors (4080214).

6438986 is a wasteful number, since it uses less digits than its factorization.

6438986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5893.

The product of its digits is 248832, while the sum is 44.

The square root of 6438986 is about 2537.5157142371. The cubic root of 6438986 is about 186.0397841441.

The spelling of 6438986 in words is "six million, four hundred thirty-eight thousand, nine hundred eighty-six".