6444442 has 4 divisors (see below), whose sum is σ = 9666666. Its totient is φ = 3222220.

The previous prime is 6444437. The next prime is 6444443. The reversal of 6444442 is 2444446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3272481 + 3171961 = 1809^2 + 1781^2 .

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 6444442.

It is not an unprimeable number, because it can be changed into a prime (6444443) 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 as a sum of consecutive naturals, namely, 1611109 + ... + 1611112.

Almost surely, 2^6444442 is an apocalyptic number.

6444442 is a deficient number, since it is larger than the sum of its proper divisors (3222224).

6444442 is a wasteful number, since it uses less digits than its factorization.

6444442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3222223.

The product of its digits is 12288, while the sum is 28.

The square root of 6444442 is about 2538.5905538310. The cubic root of 6444442 is about 186.0923155264.

Adding to 6444442 its reverse (2444446), we get a palindrome (8888888).

It can be divided in two parts, 644444 and 2, that added together give a palindrome (644446).

The spelling of 6444442 in words is "six million, four hundred forty-four thousand, four hundred forty-two".