1320309 has 6 divisors (see below), whose sum is σ = 1907126. Its totient is φ = 880200.

The previous prime is 1320307. The next prime is 1320331. The reversal of 1320309 is 9030231.

It can be written as a sum of positive squares in only one way, i.e., 1232100 + 88209 = 1110^2 + 297^2 .

It is not a de Polignac number, because 1320309 - 2¹ = 1320307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320291 and 1320300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320301) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73342 + ... + 73359.

2^1320309 is an apocalyptic number.

It is an amenable number.

1320309 is a deficient number, since it is larger than the sum of its proper divisors (586817).

1320309 is a wasteful number, since it uses less digits than its factorization.

1320309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146707 (or 146704 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 1320309 is about 1149.0469964279. The cubic root of 1320309 is about 109.7046900032.

The spelling of 1320309 in words is "one million, three hundred twenty thousand, three hundred nine".