1153989 has 6 divisors (see below), whose sum is σ = 1666886. Its totient is φ = 769320.

The previous prime is 1153973. The next prime is 1154017. The reversal of 1153989 is 9893511.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 173889 = 990^2 + 417^2 .

It is not a de Polignac number, because 1153989 - 2⁴ = 1153973 is a prime.

It is a super-2 number, since 2×1153989² = 2663381224242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1153589) 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 in 5 ways as a sum of consecutive naturals, for example, 64102 + ... + 64119.

2^1153989 is an apocalyptic number.

It is an amenable number.

1153989 is a deficient number, since it is larger than the sum of its proper divisors (512897).

1153989 is a wasteful number, since it uses less digits than its factorization.

1153989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128227 (or 128224 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1153989 is about 1074.2388002674. The cubic root of 1153989 is about 104.8899527303.

It can be divided in two parts, 11539 and 89, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 1153989 in words is "one million, one hundred fifty-three thousand, nine hundred eighty-nine".