12227781 has 8 divisors (see below), whose sum is σ = 16683040. Its totient is φ = 7962192.

The previous prime is 12227779. The next prime is 12227783. The reversal of 12227781 is 18772221.

It is a happy number.

12227781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12227779) and next prime (12227783).

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

It is not a de Polignac number, because 12227781 - 2¹ = 12227779 is a prime.

It is a super-2 number, since 2×12227781² = 299037256367922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12227783) 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, 47266 + ... + 47523.

It is an arithmetic number, because the mean of its divisors is an integer number (2085380).

Almost surely, 2^12227781 is an apocalyptic number.

It is an amenable number.

12227781 is a deficient number, since it is larger than the sum of its proper divisors (4455259).

12227781 is an equidigital number, since it uses as much as digits as its factorization.

12227781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94835.

The product of its digits is 3136, while the sum is 30.

The square root of 12227781 is about 3496.8244165242. The cubic root of 12227781 is about 230.3823570776.

It can be divided in two parts, 12 and 227781, that multiplied together give a palindrome (2733372).

The spelling of 12227781 in words is "twelve million, two hundred twenty-seven thousand, seven hundred eighty-one".