1297685 has 4 divisors (see below), whose sum is σ = 1557228. Its totient is φ = 1038144.

The previous prime is 1297669. The next prime is 1297687. The reversal of 1297685 is 5867921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5867921 = 23 ⋅255127.

It can be written as a sum of positive squares in 2 ways, for example, as 654481 + 643204 = 809^2 + 802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1297685 - 2⁴ = 1297669 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 (1297687) 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, 129764 + ... + 129773.

It is an arithmetic number, because the mean of its divisors is an integer number (389307).

2^1297685 is an apocalyptic number.

It is an amenable number.

1297685 is a deficient number, since it is larger than the sum of its proper divisors (259543).

1297685 is an equidigital number, since it uses as much as digits as its factorization.

1297685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259542.

The product of its digits is 30240, while the sum is 38.

The square root of 1297685 is about 1139.1597780821. The cubic root of 1297685 is about 109.0744658508.

The spelling of 1297685 in words is "one million, two hundred ninety-seven thousand, six hundred eighty-five".