12228905 has 8 divisors (see below), whose sum is σ = 15803592. Its totient is φ = 9030528.

The previous prime is 12228901. The next prime is 12228917. The reversal of 12228905 is 50982221.

12228905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1607824 + 10621081 = 1268^2 + 3259^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12228905 - 2² = 12228901 is a prime.

It is a super-2 number, since 2×12228905² = 299092234998050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12228901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94004 + ... + 94133.

It is an arithmetic number, because the mean of its divisors is an integer number (1975449).

Almost surely, 2^12228905 is an apocalyptic number.

It is an amenable number.

12228905 is a deficient number, since it is larger than the sum of its proper divisors (3574687).

12228905 is a wasteful number, since it uses less digits than its factorization.

12228905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188155.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 12228905 is about 3496.9851300799. The cubic root of 12228905 is about 230.3894159172.

The spelling of 12228905 in words is "twelve million, two hundred twenty-eight thousand, nine hundred five".