2143849 has 4 divisors (see below), whose sum is σ = 2196180. Its totient is φ = 2091520.

The previous prime is 2143847. The next prime is 2143859. The reversal of 2143849 is 9483412.

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 435600 + 1708249 = 660^2 + 1307^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143849 - 2¹ = 2143847 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2143849 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2143849.

It is not an unprimeable number, because it can be changed into a prime (2143847) 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, 26104 + ... + 26185.

It is an arithmetic number, because the mean of its divisors is an integer number (549045).

2^2143849 is an apocalyptic number.

It is an amenable number.

2143849 is a deficient number, since it is larger than the sum of its proper divisors (52331).

2143849 is an equidigital number, since it uses as much as digits as its factorization.

2143849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52330.

The product of its digits is 6912, while the sum is 31.

The square root of 2143849 is about 1464.1888539393. The cubic root of 2143849 is about 128.9430872878.

It can be divided in two parts, 2143 and 849, that added together give a palindrome (2992).

The spelling of 2143849 in words is "two million, one hundred forty-three thousand, eight hundred forty-nine".