42758509 has 4 divisors (see below), whose sum is σ = 43344316. Its totient is φ = 42172704.

The previous prime is 42758477. The next prime is 42758549. The reversal of 42758509 is 90585724.

42758509 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 10017225 + 32741284 = 3165^2 + 5722^2 .

It is a cyclic number.

It is not a de Polignac number, because 42758509 - 2⁵ = 42758477 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 (42758549) 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, 292794 + ... + 292939.

It is an arithmetic number, because the mean of its divisors is an integer number (10836079).

Almost surely, 2^42758509 is an apocalyptic number.

It is an amenable number.

42758509 is a deficient number, since it is larger than the sum of its proper divisors (585807).

42758509 is an equidigital number, since it uses as much as digits as its factorization.

42758509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585806.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 42758509 is about 6538.9990824284. Note that the first 3 decimals coincide. The cubic root of 42758509 is about 349.6827301736.

The spelling of 42758509 in words is "forty-two million, seven hundred fifty-eight thousand, five hundred nine".