42408644 has 6 divisors (see below), whose sum is σ = 74215134. Its totient is φ = 21204320.

The previous prime is 42408631. The next prime is 42408647. The reversal of 42408644 is 44680424.

It can be written as a sum of positive squares in only one way, i.e., 42406144 + 2500 = 6512^2 + 50^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 42408644.

It is not an unprimeable number, because it can be changed into a prime (42408647) 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, 5301077 + ... + 5301084.

It is an arithmetic number, because the mean of its divisors is an integer number (12369189).

Almost surely, 2^42408644 is an apocalyptic number.

It is an amenable number.

42408644 is a deficient number, since it is larger than the sum of its proper divisors (31806490).

42408644 is a wasteful number, since it uses less digits than its factorization.

42408644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602165 (or 10602163 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

The square root of 42408644 is about 6512.1919504879. The cubic root of 42408644 is about 348.7263750735.

The spelling of 42408644 in words is "forty-two million, four hundred eight thousand, six hundred forty-four".