1089900 has 108 divisors (see below), whose sum is σ = 3926832. Its totient is φ = 247680.

The previous prime is 1089877. The next prime is 1089917. The reversal of 1089900 is 99801.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6214 + ... + 6386.

2^1089900 is an apocalyptic number.

1089900 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 1089900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1963416).

1089900 is an abundant number, since it is smaller than the sum of its proper divisors (2836932).

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

1089900 is a wasteful number, since it uses less digits than its factorization.

1089900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 1089900 is about 1043.9827584783. The cubic root of 1089900 is about 102.9110993362.

Subtracting from 1089900 its reverse (99801), we obtain a palindrome (990099).

It can be divided in two parts, 1089 and 900, that multiplied together give a square (980100 = 990²).

The spelling of 1089900 in words is "one million, eighty-nine thousand, nine hundred".