12290556 has 24 divisors (see below), whose sum is σ = 29925504. Its totient is φ = 3918640.

The previous prime is 12290521. The next prime is 12290567. The reversal of 12290556 is 65509221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21990 + ... + 22541.

It is an arithmetic number, because the mean of its divisors is an integer number (1246896).

Almost surely, 2^12290556 is an apocalyptic number.

It is an amenable number.

12290556 is an abundant number, since it is smaller than the sum of its proper divisors (17634948).

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

12290556 is a wasteful number, since it uses less digits than its factorization.

12290556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44561 (or 44559 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 12290556 is about 3505.7889269036. The cubic root of 12290556 is about 230.7759300961.

Adding to 12290556 its reverse (65509221), we get a palindrome (77799777).

The spelling of 12290556 in words is "twelve million, two hundred ninety thousand, five hundred fifty-six".