539639 has 2 divisors, whose sum is σ = 539640. Its totient is φ = 539638.

The previous prime is 539633. The next prime is 539641. The reversal of 539639 is 936935.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-539639 is a prime.

Together with 539641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 539599 and 539608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (539633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269819 + 269820.

It is an arithmetic number, because the mean of its divisors is an integer number (269820).

2⁵³⁹⁶³⁹ is an apocalyptic number.

539639 is a deficient number, since it is larger than the sum of its proper divisors (1).

539639 is an equidigital number, since it uses as much as digits as its factorization.

539639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21870, while the sum is 35.

The square root of 539639 is about 734.6012523812. The cubic root of 539639 is about 81.4143780682.

The spelling of 539639 in words is "five hundred thirty-nine thousand, six hundred thirty-nine".