1309697 has 4 divisors (see below), whose sum is σ = 1386756. Its totient is φ = 1232640.

The previous prime is 1309691. The next prime is 1309699. The reversal of 1309697 is 7969031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7969031 = 7 ⋅1138433.

It can be written as a sum of positive squares in 2 ways, for example, as 1048576 + 261121 = 1024^2 + 511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1309697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309691) 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, 38504 + ... + 38537.

It is an arithmetic number, because the mean of its divisors is an integer number (346689).

2^1309697 is an apocalyptic number.

1309697 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1309697 is a deficient number, since it is larger than the sum of its proper divisors (77059).

1309697 is an equidigital number, since it uses as much as digits as its factorization.

1309697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77058.

The product of its (nonzero) digits is 10206, while the sum is 35.

The square root of 1309697 is about 1144.4199404065. The cubic root of 1309697 is about 109.4099814093.

The spelling of 1309697 in words is "one million, three hundred nine thousand, six hundred ninety-seven".