1128869 has 4 divisors (see below), whose sum is σ = 1290144. Its totient is φ = 967596.

The previous prime is 1128823. The next prime is 1128889. The reversal of 1128869 is 9688211.

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: 9688211 = 13 ⋅745247.

It is a de Polignac number, because none of the positive numbers 2^k-1128869 is a prime.

It is a super-2 number, since 2×1128869² = 2548690438322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128889) 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, 80627 + ... + 80640.

It is an arithmetic number, because the mean of its divisors is an integer number (322536).

2^1128869 is an apocalyptic number.

It is an amenable number.

1128869 is a deficient number, since it is larger than the sum of its proper divisors (161275).

1128869 is an equidigital number, since it uses as much as digits as its factorization.

1128869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161274.

The product of its digits is 6912, while the sum is 35.

The square root of 1128869 is about 1062.4824704436. The cubic root of 1128869 is about 104.1232820576.

The spelling of 1128869 in words is "one million, one hundred twenty-eight thousand, eight hundred sixty-nine".