6442945 has 16 divisors (see below), whose sum is σ = 8083152. Its totient is φ = 4925440.

The previous prime is 6442939. The next prime is 6442979. The reversal of 6442945 is 5492446.

It can be written as a sum of positive squares in 8 ways, for example, as 207936 + 6235009 = 456^2 + 2497^2 .

It is not a de Polignac number, because 6442945 - 2³ = 6442937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6442945.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10569 + ... + 11161.

It is an arithmetic number, because the mean of its divisors is an integer number (505197).

Almost surely, 2^6442945 is an apocalyptic number.

It is an amenable number.

6442945 is a deficient number, since it is larger than the sum of its proper divisors (1640207).

6442945 is a wasteful number, since it uses less digits than its factorization.

6442945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 34560, while the sum is 34.

The square root of 6442945 is about 2538.2956880553. The cubic root of 6442945 is about 186.0779050845.

The spelling of 6442945 in words is "six million, four hundred forty-two thousand, nine hundred forty-five".