42744145 has 4 divisors (see below), whose sum is σ = 51292980. Its totient is φ = 34195312.

The previous prime is 42744131. The next prime is 42744157. The reversal of 42744145 is 54144724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33362176 + 9381969 = 5776^2 + 3063^2 .

It is a cyclic number.

It is not a de Polignac number, because 42744145 - 2¹⁷ = 42613073 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 4274410 + ... + 4274419.

It is an arithmetic number, because the mean of its divisors is an integer number (12823245).

Almost surely, 2^42744145 is an apocalyptic number.

It is an amenable number.

42744145 is a deficient number, since it is larger than the sum of its proper divisors (8548835).

42744145 is an equidigital number, since it uses as much as digits as its factorization.

42744145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8548834.

The product of its digits is 17920, while the sum is 31.

The square root of 42744145 is about 6537.9006569387. The cubic root of 42744145 is about 349.6435691161.

Adding to 42744145 its reverse (54144724), we get a palindrome (96888869).

The spelling of 42744145 in words is "forty-two million, seven hundred forty-four thousand, one hundred forty-five".