1128889 has 2 divisors, whose sum is σ = 1128890. Its totient is φ = 1128888.

The previous prime is 1128823. The next prime is 1128899. The reversal of 1128889 is 9888211.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1092025 + 36864 = 1045^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 1128889 - 2⁷ = 1128761 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1128899) 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 as a sum of consecutive naturals, namely, 564444 + 564445.

It is an arithmetic number, because the mean of its divisors is an integer number (564445).

2^1128889 is an apocalyptic number.

It is an amenable number.

1128889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1128889 is an equidigital number, since it uses as much as digits as its factorization.

1128889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 37.

The square root of 1128889 is about 1062.4918823219. The cubic root of 1128889 is about 104.1238969661.

It can be divided in two parts, 11 and 28889, that added together give a square (28900 = 170²).

The spelling of 1128889 in words is "one million, one hundred twenty-eight thousand, eight hundred eighty-nine".