42805541 has 8 divisors (see below), whose sum is σ = 45382680. Its totient is φ = 40235008.

The previous prime is 42805487. The next prime is 42805561. The reversal of 42805541 is 14550824.

It can be written as a sum of positive squares in 4 ways, for example, as 2989441 + 39816100 = 1729^2 + 6310^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42805541 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 (42805561) 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 in 7 ways as a sum of consecutive naturals, for example, 19655 + ... + 21723.

It is an arithmetic number, because the mean of its divisors is an integer number (5672835).

Almost surely, 2^42805541 is an apocalyptic number.

It is an amenable number.

42805541 is a deficient number, since it is larger than the sum of its proper divisors (2577139).

42805541 is a wasteful number, since it uses less digits than its factorization.

42805541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 42805541 is about 6542.5943630948. The cubic root of 42805541 is about 349.8108937620.

The spelling of 42805541 in words is "forty-two million, eight hundred five thousand, five hundred forty-one".