42539605 has 4 divisors (see below), whose sum is σ = 51047532. Its totient is φ = 34031680.

The previous prime is 42539587. The next prime is 42539611. The reversal of 42539605 is 50693524.

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 23677956 + 18861649 = 4866^2 + 4343^2 .

It is not a de Polignac number, because 42539605 - 2⁷ = 42539477 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 4253956 + ... + 4253965.

It is an arithmetic number, because the mean of its divisors is an integer number (12761883).

Almost surely, 2^42539605 is an apocalyptic number.

It is an amenable number.

42539605 is a deficient number, since it is larger than the sum of its proper divisors (8507927).

42539605 is an equidigital number, since it uses as much as digits as its factorization.

42539605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8507926.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 42539605 is about 6522.2392627072. The cubic root of 42539605 is about 349.0849704028.

The spelling of 42539605 in words is "forty-two million, five hundred thirty-nine thousand, six hundred five".