42438065 has 4 divisors (see below), whose sum is σ = 50925684. Its totient is φ = 33950448.

The previous prime is 42438061. The next prime is 42438091. The reversal of 42438065 is 56083424.

42438065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13965169 + 28472896 = 3737^2 + 5336^2 .

It is a cyclic number.

It is not a de Polignac number, because 42438065 - 2² = 42438061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42438061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4243802 + ... + 4243811.

It is an arithmetic number, because the mean of its divisors is an integer number (12731421).

Almost surely, 2^42438065 is an apocalyptic number.

It is an amenable number.

42438065 is a deficient number, since it is larger than the sum of its proper divisors (8487619).

42438065 is an equidigital number, since it uses as much as digits as its factorization.

42438065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8487618.

The product of its (nonzero) digits is 23040, while the sum is 32.

The square root of 42438065 is about 6514.4504756733. The cubic root of 42438065 is about 348.8069994150.

The spelling of 42438065 in words is "forty-two million, four hundred thirty-eight thousand, sixty-five".