1089789 has 16 divisors (see below), whose sum is σ = 1520640. Its totient is φ = 693680.

The previous prime is 1089757. The next prime is 1089793. The reversal of 1089789 is 9879801.

1089789 = 18² + 19² + ... + 148².

It is a cyclic number.

It is not a de Polignac number, because 1089789 - 2⁵ = 1089757 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1089789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089709) 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, 8254 + ... + 8384.

It is an arithmetic number, because the mean of its divisors is an integer number (95040).

2^1089789 is an apocalyptic number.

It is an amenable number.

1089789 is a deficient number, since it is larger than the sum of its proper divisors (430851).

1089789 is a wasteful number, since it uses less digits than its factorization.

1089789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240.

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1089789 is about 1043.9295953272. The cubic root of 1089789 is about 102.9076055846.

Subtracting from 1089789 its product of nonzero digits (36288), we obtain a palindrome (1053501).

The spelling of 1089789 in words is "one million, eighty-nine thousand, seven hundred eighty-nine".