1281222 has 48 divisors (see below), whose sum is σ = 3032640. Its totient is φ = 389376.

The previous prime is 1281221. The next prime is 1281229. The reversal of 1281222 is 2221821.

It is a happy number.

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 = 1281195 and 1281204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16179 + ... + 16257.

It is an arithmetic number, because the mean of its divisors is an integer number (63180).

2^1281222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1281222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516320).

1281222 is an abundant number, since it is smaller than the sum of its proper divisors (1751418).

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

1281222 is a wasteful number, since it uses less digits than its factorization.

1281222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 154 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1281222 is about 1131.9107738687. The cubic root of 1281222 is about 108.6112459483.

The spelling of 1281222 in words is "one million, two hundred eighty-one thousand, two hundred twenty-two".