12405220 has 12 divisors (see below), whose sum is σ = 26051004. Its totient is φ = 4962080.

The previous prime is 12405209. The next prime is 12405221. The reversal of 12405220 is 2250421.

It can be written as a sum of positive squares in 2 ways, for example, as 7485696 + 4919524 = 2736^2 + 2218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12405194 and 12405203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12405221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310111 + ... + 310150.

It is an arithmetic number, because the mean of its divisors is an integer number (2170917).

Almost surely, 2^12405220 is an apocalyptic number.

12405220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12405220 is an abundant number, since it is smaller than the sum of its proper divisors (13645784).

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

12405220 is a wasteful number, since it uses less digits than its factorization.

12405220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620270 (or 620268 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12405220 is about 3522.1044845376. The cubic root of 12405220 is about 231.4913798071.

Adding to 12405220 its reverse (2250421), we get a palindrome (14655641).

The spelling of 12405220 in words is "twelve million, four hundred five thousand, two hundred twenty".