42539845 has 8 divisors (see below), whose sum is σ = 51162264. Its totient is φ = 33955584.

The previous prime is 42539821. The next prime is 42539851. The reversal of 42539845 is 54893524.

It can be written as a sum of positive squares in 4 ways, for example, as 23512801 + 19027044 = 4849^2 + 4362^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 42539845 - 2⁹ = 42539333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42539798 and 42539807.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7024 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (6395283).

Almost surely, 2^42539845 is an apocalyptic number.

It is an amenable number.

42539845 is a deficient number, since it is larger than the sum of its proper divisors (8622419).

42539845 is a wasteful number, since it uses less digits than its factorization.

42539845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19079.

The product of its digits is 172800, while the sum is 40.

The square root of 42539845 is about 6522.2576612704. The cubic root of 42539845 is about 349.0856268909.

The spelling of 42539845 in words is "forty-two million, five hundred thirty-nine thousand, eight hundred forty-five".