2000639 has 2 divisors, whose sum is σ = 2000640. Its totient is φ = 2000638.

The previous prime is 2000633. The next prime is 2000653. The reversal of 2000639 is 9360002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2000639 - 2¹² = 1996543 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2000639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000319 + 1000320.

It is an arithmetic number, because the mean of its divisors is an integer number (1000320).

2^2000639 is an apocalyptic number.

2000639 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000639 is an equidigital number, since it uses as much as digits as its factorization.

2000639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 2000639 is about 1414.4394649472. The cubic root of 2000639 is about 126.0055217199.

The spelling of 2000639 in words is "two million, six hundred thirty-nine", and thus it is an aban number.