1268689 has 4 divisors (see below), whose sum is σ = 1273456. Its totient is φ = 1263924.

The previous prime is 1268681. The next prime is 1268713. The reversal of 1268689 is 9868621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9868621 = 7 ⋅1409803.

It is a cyclic number.

It is not a de Polignac number, because 1268689 - 2³ = 1268681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1268681) 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, 1959 + ... + 2524.

It is an arithmetic number, because the mean of its divisors is an integer number (318364).

2^1268689 is an apocalyptic number.

It is an amenable number.

1268689 is a deficient number, since it is larger than the sum of its proper divisors (4767).

1268689 is an equidigital number, since it uses as much as digits as its factorization.

1268689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4766.

The product of its digits is 41472, while the sum is 40.

The square root of 1268689 is about 1126.3609545789. The cubic root of 1268689 is about 108.2559373560.

The spelling of 1268689 in words is "one million, two hundred sixty-eight thousand, six hundred eighty-nine".