1089816 has 64 divisors (see below), whose sum is σ = 3360000. Its totient is φ = 286848.

The previous prime is 1089799. The next prime is 1089841. The reversal of 1089816 is 6189801.

1089816 = T₅ + T₆ + ... + T₁₈₆.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1935 + ... + 2433.

It is an arithmetic number, because the mean of its divisors is an integer number (52500).

2^1089816 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 1089816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1680000).

1089816 is an abundant number, since it is smaller than the sum of its proper divisors (2270184).

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

1089816 is a wasteful number, since it uses less digits than its factorization.

1089816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1089816 is about 1043.9425271537. The cubic root of 1089816 is about 102.9084554379.

The spelling of 1089816 in words is "one million, eighty-nine thousand, eight hundred sixteen".