11289820 has 12 divisors (see below), whose sum is σ = 23708664. Its totient is φ = 4515920.

The previous prime is 11289809. The next prime is 11289841. The reversal of 11289820 is 2898211.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282226 + ... + 282265.

It is an arithmetic number, because the mean of its divisors is an integer number (1975722).

Almost surely, 2^11289820 is an apocalyptic number.

11289820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11289820 is an abundant number, since it is smaller than the sum of its proper divisors (12418844).

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

11289820 is a wasteful number, since it uses less digits than its factorization.

11289820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564500 (or 564498 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 11289820 is about 3360.0327379357. The cubic root of 11289820 is about 224.3342957072.

It can be divided in two parts, 1 and 1289820, that added together give a palindrome (1289821).

The spelling of 11289820 in words is "eleven million, two hundred eighty-nine thousand, eight hundred twenty".