12220545 has 32 divisors (see below), whose sum is σ = 20377728. Its totient is φ = 6248448.

The previous prime is 12220543. The next prime is 12220561. The reversal of 12220545 is 54502221.

It is a happy number.

It is not a de Polignac number, because 12220545 - 2¹ = 12220543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12220543) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 53722 + ... + 53948.

It is an arithmetic number, because the mean of its divisors is an integer number (636804).

Almost surely, 2^12220545 is an apocalyptic number.

12220545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12220545 is a deficient number, since it is larger than the sum of its proper divisors (8157183).

12220545 is a wasteful number, since it uses less digits than its factorization.

12220545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 12220545 is about 3495.7896103742. The cubic root of 12220545 is about 230.3369038680.

Adding to 12220545 its reverse (54502221), we get a palindrome (66722766).

The spelling of 12220545 in words is "twelve million, two hundred twenty thousand, five hundred forty-five".