6442986 has 32 divisors (see below), whose sum is σ = 14406336. Its totient is φ = 1904000.

The previous prime is 6442981. The next prime is 6442993. The reversal of 6442986 is 6892446.

It is not an unprimeable number, because it can be changed into a prime (6442981) 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 15 ways as a sum of consecutive naturals, for example, 1516 + ... + 3896.

It is an arithmetic number, because the mean of its divisors is an integer number (450198).

Almost surely, 2^6442986 is an apocalyptic number.

6442986 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 6442986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7203168).

6442986 is an abundant number, since it is smaller than the sum of its proper divisors (7963350).

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

6442986 is a wasteful number, since it uses less digits than its factorization.

6442986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438.

The product of its digits is 82944, while the sum is 39.

The square root of 6442986 is about 2538.3037643277. The cubic root of 6442986 is about 186.0782997890.

The spelling of 6442986 in words is "six million, four hundred forty-two thousand, nine hundred eighty-six".