1158989 has 4 divisors (see below), whose sum is σ = 1248156. Its totient is φ = 1069824.

The previous prime is 1158977. The next prime is 1158991. The reversal of 1158989 is 9898511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9898511 = 7 ⋅1414073.

It can be written as a sum of positive squares in 2 ways, for example, as 218089 + 940900 = 467^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 1158989 - 2¹² = 1154893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1158089) 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, 44564 + ... + 44589.

It is an arithmetic number, because the mean of its divisors is an integer number (312039).

2^1158989 is an apocalyptic number.

It is an amenable number.

1158989 is a deficient number, since it is larger than the sum of its proper divisors (89167).

1158989 is an equidigital number, since it uses as much as digits as its factorization.

1158989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89166.

The product of its digits is 25920, while the sum is 41.

The square root of 1158989 is about 1076.5635141505. The cubic root of 1158989 is about 105.0412234204.

The spelling of 1158989 in words is "one million, one hundred fifty-eight thousand, nine hundred eighty-nine".