2006539 has 4 divisors (see below), whose sum is σ = 2075760. Its totient is φ = 1937320.

The previous prime is 2006507. The next prime is 2006549. The reversal of 2006539 is 9356002.

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 2006539 - 2⁵ = 2006507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2006549) 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, 34567 + ... + 34624.

It is an arithmetic number, because the mean of its divisors is an integer number (518940).

2^2006539 is an apocalyptic number.

2006539 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2006539 is a deficient number, since it is larger than the sum of its proper divisors (69221).

2006539 is an equidigital number, since it uses as much as digits as its factorization.

2006539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69220.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 2006539 is about 1416.5235613995. The cubic root of 2006539 is about 126.1292660110.

The spelling of 2006539 in words is "two million, six thousand, five hundred thirty-nine".