1089920 has 64 divisors (see below), whose sum is σ = 2827440. Its totient is φ = 399360.

The previous prime is 1089919. The next prime is 1089941. The reversal of 1089920 is 299801.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8255 + ... + 8385.

2^1089920 is an apocalyptic number.

1089920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1089920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413720).

1089920 is an abundant number, since it is smaller than the sum of its proper divisors (1737520).

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

1089920 is a wasteful number, since it uses less digits than its factorization.

1089920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1089920 is about 1043.9923371366. The cubic root of 1089920 is about 102.9117288158.

The spelling of 1089920 in words is "one million, eighty-nine thousand, nine hundred twenty".