999539 has 4 divisors (see below), whose sum is σ = 1023960. Its totient is φ = 975120.

The previous prime is 999529. The next prime is 999541. The reversal of 999539 is 935999.

999539 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 not a de Polignac number, because 999539 - 2¹² = 995443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 999539.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999529) 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, 12149 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (255990).

2⁹⁹⁹⁵³⁹ is an apocalyptic number.

999539 is a deficient number, since it is larger than the sum of its proper divisors (24421).

999539 is a wasteful number, since it uses less digits than its factorization.

999539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24420.

The product of its digits is 98415, while the sum is 44.

The square root of 999539 is about 999.7694734287. The cubic root of 999539 is about 99.9846309714.

The spelling of 999539 in words is "nine hundred ninety-nine thousand, five hundred thirty-nine".