1243009 has 8 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 1191216.

The previous prime is 1243003. The next prime is 1243013. The reversal of 1243009 is 9003421.

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 1243009 - 2⁵ = 1242977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2242 + ... + 2740.

It is an arithmetic number, because the mean of its divisors is an integer number (162000).

2^1243009 is an apocalyptic number.

It is an amenable number.

1243009 is a deficient number, since it is larger than the sum of its proper divisors (52991).

1243009 is an equidigital number, since it uses as much as digits as its factorization.

1243009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1243009 is about 1114.9031348059. The cubic root of 1243009 is about 107.5205369092.

Adding to 1243009 its product of nonzero digits (216), we get a square (1243225 = 1115²).

The spelling of 1243009 in words is "one million, two hundred forty-three thousand, nine".