2008781 has 2 divisors, whose sum is σ = 2008782. Its totient is φ = 2008780.

The previous prime is 2008777. The next prime is 2008793. The reversal of 2008781 is 1878002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 292681 = 1310^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2008781 - 2² = 2008777 is a prime.

It is a super-2 number, since 2×2008781² = 8070402211922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2008781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2008081) 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, 1004390 + 1004391.

It is an arithmetic number, because the mean of its divisors is an integer number (1004391).

2^2008781 is an apocalyptic number.

It is an amenable number.

2008781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2008781 is an equidigital number, since it uses as much as digits as its factorization.

2008781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 2008781 is about 1417.3147145218. The cubic root of 2008781 is about 126.1762252375.

The spelling of 2008781 in words is "two million, eight thousand, seven hundred eighty-one".