842540539 has 2 divisors, whose sum is σ = 842540540. Its totient is φ = 842540538.

The previous prime is 842540527. The next prime is 842540561. The reversal of 842540539 is 935045248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842540539 - 2⁵ = 842540507 is a prime.

It is not a weakly prime, because it can be changed into another prime (842546539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421270269 + 421270270.

It is an arithmetic number, because the mean of its divisors is an integer number (421270270).

Almost surely, 2^842540539 is an apocalyptic number.

842540539 is a deficient number, since it is larger than the sum of its proper divisors (1).

842540539 is an equidigital number, since it uses as much as digits as its factorization.

842540539 is an evil number, because the sum of its binary digits is even.

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

The square root of 842540539 is about 29026.5488647893. The cubic root of 842540539 is about 944.4890677012.

The spelling of 842540539 in words is "eight hundred forty-two million, five hundred forty thousand, five hundred thirty-nine".