1397309 has 4 divisors (see below), whose sum is σ = 1403004. Its totient is φ = 1391616.

The previous prime is 1397303. The next prime is 1397311. The reversal of 1397309 is 9037931.

It is a happy number.

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 1162084 + 235225 = 1078^2 + 485^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397309 - 2¹⁶ = 1331773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397303) 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 3 ways as a sum of consecutive naturals, for example, 2462 + ... + 2975.

It is an arithmetic number, because the mean of its divisors is an integer number (350751).

2^1397309 is an apocalyptic number.

It is an amenable number.

1397309 is a deficient number, since it is larger than the sum of its proper divisors (5695).

1397309 is an equidigital number, since it uses as much as digits as its factorization.

1397309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5694.

The product of its (nonzero) digits is 5103, while the sum is 32.

The square root of 1397309 is about 1182.0782546008. The cubic root of 1397309 is about 111.7971722366.

The spelling of 1397309 in words is "one million, three hundred ninety-seven thousand, three hundred nine".