1297686 has 32 divisors (see below), whose sum is σ = 2838528. Its totient is φ = 393120.

The previous prime is 1297669. The next prime is 1297687. The reversal of 1297686 is 6867921.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 15 ways as a sum of consecutive naturals, for example, 9841 + ... + 9971.

It is an arithmetic number, because the mean of its divisors is an integer number (88704).

2^1297686 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1297686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1419264).

1297686 is an abundant number, since it is smaller than the sum of its proper divisors (1540842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1297686 is a wasteful number, since it uses less digits than its factorization.

1297686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276.

The product of its digits is 36288, while the sum is 39.

The square root of 1297686 is about 1139.1602170020. The cubic root of 1297686 is about 109.0744938685.

The spelling of 1297686 in words is "one million, two hundred ninety-seven thousand, six hundred eighty-six".