2193861 has 4 divisors (see below), whose sum is σ = 2925152. Its totient is φ = 1462572.

The previous prime is 2193853. The next prime is 2193881. The reversal of 2193861 is 1683912.

2193861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2193861 - 2³ = 2193853 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365641 + ... + 365646.

It is an arithmetic number, because the mean of its divisors is an integer number (731288).

2^2193861 is an apocalyptic number.

It is an amenable number.

2193861 is a deficient number, since it is larger than the sum of its proper divisors (731291).

2193861 is an equidigital number, since it uses as much as digits as its factorization.

2193861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731290.

The product of its digits is 2592, while the sum is 30.

The square root of 2193861 is about 1481.1687952425. The cubic root of 2193861 is about 129.9380572751.

The spelling of 2193861 in words is "two million, one hundred ninety-three thousand, eight hundred sixty-one".