540138839 has 4 divisors (see below), whose sum is σ = 554737224. Its totient is φ = 525540456.

The previous prime is 540138827. The next prime is 540138853. The reversal of 540138839 is 938831045.

540138839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-540138839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 540138796 and 540138805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (540138439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7299137 + ... + 7299210.

It is an arithmetic number, because the mean of its divisors is an integer number (138684306).

Almost surely, 2^540138839 is an apocalyptic number.

540138839 is a deficient number, since it is larger than the sum of its proper divisors (14598385).

540138839 is a wasteful number, since it uses less digits than its factorization.

540138839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14598384.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 540138839 is about 23240.8872248888. The cubic root of 540138839 is about 814.3950691884.

The spelling of 540138839 in words is "five hundred forty million, one hundred thirty-eight thousand, eight hundred thirty-nine".