2117853 has 8 divisors (see below), whose sum is σ = 3137600. Its totient is φ = 1411884.

The previous prime is 2117849. The next prime is 2117861. The reversal of 2117853 is 3587112.

It is not a de Polignac number, because 2117853 - 2² = 2117849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 78439 = 2117853 / (2 + 1 + 1 + 7 + 8 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39193 + ... + 39246.

It is an arithmetic number, because the mean of its divisors is an integer number (392200).

2^2117853 is an apocalyptic number.

It is an amenable number.

2117853 is a deficient number, since it is larger than the sum of its proper divisors (1019747).

2117853 is an equidigital number, since it uses as much as digits as its factorization.

2117853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78448 (or 78442 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 2117853 is about 1455.2845082663. The cubic root of 2117853 is about 128.4197847057.

It can be divided in two parts, 2 and 117853, that added together give a triangular number (117855 = T₄₈₅).

The spelling of 2117853 in words is "two million, one hundred seventeen thousand, eight hundred fifty-three".