2006139 has 4 divisors (see below), whose sum is σ = 2674856. Its totient is φ = 1337424.

The previous prime is 2006111. The next prime is 2006141. The reversal of 2006139 is 9316002.

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

It is not a de Polignac number, because 2006139 - 2¹¹ = 2004091 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006159) 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, 334354 + ... + 334359.

It is an arithmetic number, because the mean of its divisors is an integer number (668714).

2^2006139 is an apocalyptic number.

2006139 is a deficient number, since it is larger than the sum of its proper divisors (668717).

2006139 is an equidigital number, since it uses as much as digits as its factorization.

2006139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668716.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 2006139 is about 1416.3823636293. The cubic root of 2006139 is about 126.1208842387.

It can be divided in two parts, 20061 and 39, that added together give a triangular number (20100 = T₂₀₀).

The spelling of 2006139 in words is "two million, six thousand, one hundred thirty-nine".