6400986 has 16 divisors (see below), whose sum is σ = 13476000. Its totient is φ = 2021328.

The previous prime is 6400981. The next prime is 6400987. The reversal of 6400986 is 6890046.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6400981) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27961 + ... + 28188.

It is an arithmetic number, because the mean of its divisors is an integer number (842250).

Almost surely, 2^6400986 is an apocalyptic number.

6400986 is an abundant number, since it is smaller than the sum of its proper divisors (7075014).

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

6400986 is a wasteful number, since it uses less digits than its factorization.

6400986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56173.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 6400986 is about 2530.0169959903. The cubic root of 6400986 is about 185.6730874520.

The spelling of 6400986 in words is "six million, four hundred thousand, nine hundred eighty-six".