12205500 has 96 divisors (see below), whose sum is σ = 36341760. Its totient is φ = 3182400.

The previous prime is 12205483. The next prime is 12205511. The reversal of 12205500 is 550221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12205500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118449 + ... + 118551.

It is an arithmetic number, because the mean of its divisors is an integer number (378560).

Almost surely, 2^12205500 is an apocalyptic number.

12205500 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 12205500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18170880).

12205500 is an abundant number, since it is smaller than the sum of its proper divisors (24136260).

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

12205500 is a wasteful number, since it uses less digits than its factorization.

12205500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 12205500 is about 3493.6370733091. The cubic root of 12205500 is about 230.2423406601.

Adding to 12205500 its reverse (550221), we get a palindrome (12755721).

The spelling of 12205500 in words is "twelve million, two hundred five thousand, five hundred".