542865839 has 4 divisors (see below), whose sum is σ = 554416224. Its totient is φ = 531315456.

The previous prime is 542865821. The next prime is 542865847. The reversal of 542865839 is 938568245.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-542865839 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 (542865859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775122 + ... + 5775215.

It is an arithmetic number, because the mean of its divisors is an integer number (138604056).

Almost surely, 2^542865839 is an apocalyptic number.

542865839 is a deficient number, since it is larger than the sum of its proper divisors (11550385).

542865839 is a wasteful number, since it uses less digits than its factorization.

542865839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11550384.

The product of its digits is 2073600, while the sum is 50.

The square root of 542865839 is about 23299.4815178364. The cubic root of 542865839 is about 815.7633151297.

The spelling of 542865839 in words is "five hundred forty-two million, eight hundred sixty-five thousand, eight hundred thirty-nine".