1320123309 has 8 divisors (see below), whose sum is σ = 1764086400. Its totient is φ = 878121216.

The previous prime is 1320123283. The next prime is 1320123323. The reversal of 1320123309 is 9033210231.

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

It is a de Polignac number, because none of the positive numbers 2^k-1320123309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320123109) 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, 488677 + ... + 491370.

It is an arithmetic number, because the mean of its divisors is an integer number (220510800).

Almost surely, 2^1320123309 is an apocalyptic number.

It is an amenable number.

1320123309 is a deficient number, since it is larger than the sum of its proper divisors (443963091).

1320123309 is an equidigital number, since it uses as much as digits as its factorization.

1320123309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980499.

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 1320123309 is about 36333.5011938018. The cubic root of 1320123309 is about 1096.9954673023.

The spelling of 1320123309 in words is "one billion, three hundred twenty million, one hundred twenty-three thousand, three hundred nine".