1222156 has 24 divisors (see below), whose sum is σ = 2426480. Its totient is φ = 533952.

The previous prime is 1222129. The next prime is 1222157. The reversal of 1222156 is 6512221.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1222157) 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, 370 + ... + 1606.

2^1222156 is an apocalyptic number.

It is an amenable number.

1222156 is a deficient number, since it is larger than the sum of its proper divisors (1204324).

1222156 is a wasteful number, since it uses less digits than its factorization.

1222156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1271 counting only the distinct ones).

The product of its digits is 240, while the sum is 19.

The square root of 1222156 is about 1105.5116462525. The cubic root of 1222156 is about 106.9158799645.

Adding to 1222156 its reverse (6512221), we get a palindrome (7734377).

It can be divided in two parts, 122215 and 6, that added together give a palindrome (122221).

The spelling of 1222156 in words is "one million, two hundred twenty-two thousand, one hundred fifty-six".