2109847 has 4 divisors (see below), whose sum is σ = 2131696. Its totient is φ = 2088000.

The previous prime is 2109841. The next prime is 2109857. The reversal of 2109847 is 7489012.

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

It is a cyclic number.

It is not a de Polignac number, because 2109847 - 2¹⁹ = 1585559 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 (2109841) 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, 10779 + ... + 10972.

It is an arithmetic number, because the mean of its divisors is an integer number (532924).

2^2109847 is an apocalyptic number.

2109847 is a deficient number, since it is larger than the sum of its proper divisors (21849).

2109847 is an equidigital number, since it uses as much as digits as its factorization.

2109847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21848.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 2109847 is about 1452.5312389068. The cubic root of 2109847 is about 128.2577610195.

The spelling of 2109847 in words is "two million, one hundred nine thousand, eight hundred forty-seven".