1089440136 has 96 divisors (see below), whose sum is σ = 3061071000. Its totient is φ = 349747200.

The previous prime is 1089440111. The next prime is 1089440137. The reversal of 1089440136 is 6310449801.

1089440136 is a `hidden beast` number, since 1 + 0 + 89 + 440 + 136 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1089396036 + 44100 = 33006^2 + 210^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1089440136.

It is not an unprimeable number, because it can be changed into a prime (1089440137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 267040 + ... + 271088.

Almost surely, 2^1089440136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1089440136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530535500).

1089440136 is an abundant number, since it is smaller than the sum of its proper divisors (1971630864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1089440136 is a wasteful number, since it uses less digits than its factorization.

1089440136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4199 (or 4192 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1089440136 is about 33006.6680535918. The cubic root of 1089440136 is about 1028.9662346158.

Adding to 1089440136 its reverse (6310449801), we get a palindrome (7399889937).

The spelling of 1089440136 in words is "one billion, eighty-nine million, four hundred forty thousand, one hundred thirty-six".