2681805 has 16 divisors (see below), whose sum is σ = 4904064. Its totient is φ = 1225920.

The previous prime is 2681803. The next prime is 2681807. The reversal of 2681805 is 5081862.

It is an interprime number because it is at equal distance from previous prime (2681803) and next prime (2681807).

It is not a de Polignac number, because 2681805 - 2¹ = 2681803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681803) 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 in 15 ways as a sum of consecutive naturals, for example, 12666 + ... + 12875.

It is an arithmetic number, because the mean of its divisors is an integer number (306504).

2^2681805 is an apocalyptic number.

It is an amenable number.

2681805 is a deficient number, since it is larger than the sum of its proper divisors (2222259).

2681805 is a wasteful number, since it uses less digits than its factorization.

2681805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25556.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 2681805 is about 1637.6217511990. The cubic root of 2681805 is about 138.9341682294.

It can be divided in two parts, 2681 and 805, that added together give a triangular number (3486 = T₈₃).

The spelling of 2681805 in words is "two million, six hundred eighty-one thousand, eight hundred five".