12143709 has 8 divisors (see below), whose sum is σ = 17990720. Its totient is φ = 8095788.

The previous prime is 12143707. The next prime is 12143711. The reversal of 12143709 is 90734121.

12143709 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12143707) and next prime (12143711).

It is not a de Polignac number, because 12143709 - 2¹ = 12143707 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: 449767 = 12143709 / (1 + 2 + 1 + 4 + 3 + 7 + 0 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224857 + ... + 224910.

It is an arithmetic number, because the mean of its divisors is an integer number (2248840).

Almost surely, 2^12143709 is an apocalyptic number.

It is an amenable number.

12143709 is a deficient number, since it is larger than the sum of its proper divisors (5847011).

12143709 is an equidigital number, since it uses as much as digits as its factorization.

12143709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449776 (or 449770 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 12143709 is about 3484.7824896254. The cubic root of 12143709 is about 229.8531450685.

The spelling of 12143709 in words is "twelve million, one hundred forty-three thousand, seven hundred nine".