1143209 has 8 divisors (see below), whose sum is σ = 1200000. Its totient is φ = 1087632.

The previous prime is 1143193. The next prime is 1143217. The reversal of 1143209 is 9023411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1143209 - 2⁴ = 1143193 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (1143239) 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, 2042 + ... + 2540.

It is an arithmetic number, because the mean of its divisors is an integer number (150000).

2^1143209 is an apocalyptic number.

It is an amenable number.

1143209 is a deficient number, since it is larger than the sum of its proper divisors (56791).

1143209 is an equidigital number, since it uses as much as digits as its factorization.

1143209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1143209 is about 1069.2095210949. The cubic root of 1143209 is about 104.5623202211.

The spelling of 1143209 in words is "one million, one hundred forty-three thousand, two hundred nine".