1268889 has 8 divisors (see below), whose sum is σ = 1700160. Its totient is φ = 841776.

The previous prime is 1268881. The next prime is 1268899. The reversal of 1268889 is 9888621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1268889 - 2³ = 1268881 is a prime.

It is a super-2 number, since 2×1268889² = 3220158588642, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 1268889.

It is not an unprimeable number, because it can be changed into a prime (1268881) 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 7 ways as a sum of consecutive naturals, for example, 237 + ... + 1610.

It is an arithmetic number, because the mean of its divisors is an integer number (212520).

2^1268889 is an apocalyptic number.

It is an amenable number.

1268889 is a deficient number, since it is larger than the sum of its proper divisors (431271).

1268889 is a wasteful number, since it uses less digits than its factorization.

1268889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2079.

The product of its digits is 55296, while the sum is 42.

The square root of 1268889 is about 1126.4497325669. The cubic root of 1268889 is about 108.2616256557.

The spelling of 1268889 in words is "one million, two hundred sixty-eight thousand, eight hundred eighty-nine".