42047539 has 2 divisors, whose sum is σ = 42047540. Its totient is φ = 42047538.

The previous prime is 42047531. The next prime is 42047561. The reversal of 42047539 is 93574024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42047539 - 2³ = 42047531 is a prime.

It is not a weakly prime, because it can be changed into another prime (42047531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21023769 + 21023770.

It is an arithmetic number, because the mean of its divisors is an integer number (21023770).

Almost surely, 2^42047539 is an apocalyptic number.

42047539 is a deficient number, since it is larger than the sum of its proper divisors (1).

42047539 is an equidigital number, since it uses as much as digits as its factorization.

42047539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 42047539 is about 6484.4073746180. The cubic root of 42047539 is about 347.7337633166.

The spelling of 42047539 in words is "forty-two million, forty-seven thousand, five hundred thirty-nine".