12390228 has 18 divisors (see below), whose sum is σ = 31319834. Its totient is φ = 4130064.

The previous prime is 12390211. The next prime is 12390251. The reversal of 12390228 is 82209321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8749764 + 3640464 = 2958^2 + 1908^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 172051 + ... + 172122.

Almost surely, 2^12390228 is an apocalyptic number.

12390228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12390228 is an abundant number, since it is smaller than the sum of its proper divisors (18929606).

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

12390228 is a wasteful number, since it uses less digits than its factorization.

12390228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344183 (or 344178 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12390228 is about 3519.9755680970. The cubic root of 12390228 is about 231.3980879570.

Adding to 12390228 its reverse (82209321), we get a palindrome (94599549).

The spelling of 12390228 in words is "twelve million, three hundred ninety thousand, two hundred twenty-eight".