2006861 has 4 divisors (see below), whose sum is σ = 2029500. Its totient is φ = 1984224.

The previous prime is 2006831. The next prime is 2006869. The reversal of 2006861 is 1686002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1357225 + 649636 = 1165^2 + 806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2006861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006869) 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, 11186 + ... + 11363.

It is an arithmetic number, because the mean of its divisors is an integer number (507375).

2^2006861 is an apocalyptic number.

It is an amenable number.

2006861 is a deficient number, since it is larger than the sum of its proper divisors (22639).

2006861 is an equidigital number, since it uses as much as digits as its factorization.

2006861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22638.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2006861 is about 1416.6372153801. The cubic root of 2006861 is about 126.1360125285.

The spelling of 2006861 in words is "two million, six thousand, eight hundred sixty-one".