2198905 has 4 divisors (see below), whose sum is σ = 2638692. Its totient is φ = 1759120.

The previous prime is 2198897. The next prime is 2198909. The reversal of 2198905 is 5098912.

2198905 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1236544 + 962361 = 1112^2 + 981^2 .

It is not a de Polignac number, because 2198905 - 2³ = 2198897 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 (2198909) 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, 219886 + ... + 219895.

It is an arithmetic number, because the mean of its divisors is an integer number (659673).

2^2198905 is an apocalyptic number.

It is an amenable number.

2198905 is a deficient number, since it is larger than the sum of its proper divisors (439787).

2198905 is an equidigital number, since it uses as much as digits as its factorization.

2198905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439786.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 2198905 is about 1482.8705270522. The cubic root of 2198905 is about 130.0375631097.

The spelling of 2198905 in words is "two million, one hundred ninety-eight thousand, nine hundred five".