11811222 has 24 divisors (see below), whose sum is σ = 25791480. Its totient is φ = 3906240.

The previous prime is 11811221. The next prime is 11811227. The reversal of 11811222 is 22211811.

11811222 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 11811195 and 11811204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11811221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147 + ... + 4862.

It is an arithmetic number, because the mean of its divisors is an integer number (1074645).

Almost surely, 2^11811222 is an apocalyptic number.

11811222 is an abundant number, since it is smaller than the sum of its proper divisors (13980258).

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

11811222 is a wasteful number, since it uses less digits than its factorization.

11811222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5148 (or 5145 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 11811222 is about 3436.7458445454. The cubic root of 11811222 is about 227.7359593443.

The spelling of 11811222 in words is "eleven million, eight hundred eleven thousand, two hundred twenty-two".