6442665 has 8 divisors (see below), whose sum is σ = 10308288. Its totient is φ = 3436080.

The previous prime is 6442661. The next prime is 6442673. The reversal of 6442665 is 5662446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6442665 - 2² = 6442661 is a prime.

6442665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6442661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214741 + ... + 214770.

It is an arithmetic number, because the mean of its divisors is an integer number (1288536).

Almost surely, 2^6442665 is an apocalyptic number.

It is an amenable number.

6442665 is a deficient number, since it is larger than the sum of its proper divisors (3865623).

6442665 is a wasteful number, since it uses less digits than its factorization.

6442665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429519.

The product of its digits is 34560, while the sum is 33.

The square root of 6442665 is about 2538.2405323373. The cubic root of 6442665 is about 186.0752094969.

The spelling of 6442665 in words is "six million, four hundred forty-two thousand, six hundred sixty-five".