1128999 has 16 divisors (see below), whose sum is σ = 1641600. Its totient is φ = 687456.

The previous prime is 1128997. The next prime is 1129013. The reversal of 1128999 is 9998211.

It is a happy number.

It is not a de Polignac number, because 1128999 - 2¹ = 1128997 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1128997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1312 + ... + 1994.

It is an arithmetic number, because the mean of its divisors is an integer number (102600).

2^1128999 is an apocalyptic number.

1128999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1128999 is a deficient number, since it is larger than the sum of its proper divisors (512601).

1128999 is a wasteful number, since it uses less digits than its factorization.

1128999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 734.

The product of its digits is 11664, while the sum is 39.

The square root of 1128999 is about 1062.5436461624. The cubic root of 1128999 is about 104.1272788329.

The spelling of 1128999 in words is "one million, one hundred twenty-eight thousand, nine hundred ninety-nine".