1128609 has 12 divisors (see below), whose sum is σ = 1649700. Its totient is φ = 743424.

The previous prime is 1128601. The next prime is 1128623. The reversal of 1128609 is 9068211.

It can be written as a sum of positive squares in 2 ways, for example, as 88209 + 1040400 = 297^2 + 1020^2 .

It is not a de Polignac number, because 1128609 - 2³ = 1128601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1128601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (137475).

2^1128609 is an apocalyptic number.

It is an amenable number.

1128609 is a deficient number, since it is larger than the sum of its proper divisors (521091).

1128609 is a wasteful number, since it uses less digits than its factorization.

1128609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504 (or 1501 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The square root of 1128609 is about 1062.3601084378. The cubic root of 1128609 is about 104.1152875864.

The spelling of 1128609 in words is "one million, one hundred twenty-eight thousand, six hundred nine".