2143309 has 24 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 1653120.

The previous prime is 2143279. The next prime is 2143313. The reversal of 2143309 is 9033412.

It is not a de Polignac number, because 2143309 - 2¹¹ = 2141261 is a prime.

It is an Ulam number.

2143309 is a lucky number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2143309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2143319) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25782 + ... + 25864.

It is an arithmetic number, because the mean of its divisors is an integer number (114912).

2^2143309 is an apocalyptic number.

It is an amenable number.

2143309 is a deficient number, since it is larger than the sum of its proper divisors (614579).

2143309 is a wasteful number, since it uses less digits than its factorization.

2143309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 2143309 is about 1464.0044398840. The cubic root of 2143309 is about 128.9322601705.

The spelling of 2143309 in words is "two million, one hundred forty-three thousand, three hundred nine".