2183861 has 4 divisors (see below), whose sum is σ = 2219724. Its totient is φ = 2148000.

The previous prime is 2183849. The next prime is 2183869. The reversal of 2183861 is 1683812.

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 207025 + 1976836 = 455^2 + 1406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2183861 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 (2183869) 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, 17840 + ... + 17961.

It is an arithmetic number, because the mean of its divisors is an integer number (554931).

2^2183861 is an apocalyptic number.

It is an amenable number.

2183861 is a deficient number, since it is larger than the sum of its proper divisors (35863).

2183861 is an equidigital number, since it uses as much as digits as its factorization.

2183861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35862.

The product of its digits is 2304, while the sum is 29.

The square root of 2183861 is about 1477.7892271904. The cubic root of 2183861 is about 129.7403297899.

The spelling of 2183861 in words is "two million, one hundred eighty-three thousand, eight hundred sixty-one".