2681806 has 4 divisors (see below), whose sum is σ = 4022712. Its totient is φ = 1340902.

The previous prime is 2681803. The next prime is 2681807. The reversal of 2681806 is 6081862.

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

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 as a sum of consecutive naturals, namely, 670450 + ... + 670453.

It is an arithmetic number, because the mean of its divisors is an integer number (1005678).

2^2681806 is an apocalyptic number.

2681806 is a deficient number, since it is larger than the sum of its proper divisors (1340906).

2681806 is a wasteful number, since it uses less digits than its factorization.

2681806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340905.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 2681806 is about 1637.6220565198. The cubic root of 2681806 is about 138.9341854982.

The spelling of 2681806 in words is "two million, six hundred eighty-one thousand, eight hundred six".