1323423209 has 4 divisors (see below), whose sum is σ = 1323560004. Its totient is φ = 1323286416.

The previous prime is 1323423203. The next prime is 1323423217. The reversal of 1323423209 is 9023243231.

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 521117584 + 802305625 = 22828^2 + 28325^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1323423209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1323423203) 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, 52682 + ... + 73635.

It is an arithmetic number, because the mean of its divisors is an integer number (330890001).

Almost surely, 2^1323423209 is an apocalyptic number.

It is an amenable number.

1323423209 is a deficient number, since it is larger than the sum of its proper divisors (136795).

1323423209 is a wasteful number, since it uses less digits than its factorization.

1323423209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136794.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1323423209 is about 36378.8841087794. The cubic root of 1323423209 is about 1097.9087565450.

The spelling of 1323423209 in words is "one billion, three hundred twenty-three million, four hundred twenty-three thousand, two hundred nine".