42444013 has 4 divisors (see below), whose sum is σ = 43041888. Its totient is φ = 41846140.

The previous prime is 42444001. The next prime is 42444029. The reversal of 42444013 is 31044424.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42444013 - 2¹³ = 42435821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42844013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298831 + ... + 298972.

It is an arithmetic number, because the mean of its divisors is an integer number (10760472).

Almost surely, 2^42444013 is an apocalyptic number.

It is an amenable number.

42444013 is a deficient number, since it is larger than the sum of its proper divisors (597875).

42444013 is an equidigital number, since it uses as much as digits as its factorization.

42444013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597874.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 42444013 is about 6514.9069832193. The cubic root of 42444013 is about 348.8232945902.

Adding to 42444013 its reverse (31044424), we get a palindrome (73488437).

The spelling of 42444013 in words is "forty-two million, four hundred forty-four thousand, thirteen".