1222155 has 32 divisors (see below), whose sum is σ = 2373120. Its totient is φ = 591840.

The previous prime is 1222129. The next prime is 1222157. The reversal of 1222155 is 5512221.

It is not a de Polignac number, because 1222155 - 2⁷ = 1222027 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 1074 + ... + 1896.

It is an arithmetic number, because the mean of its divisors is an integer number (74160).

2^1222155 is an apocalyptic number.

1222155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1222155 is a deficient number, since it is larger than the sum of its proper divisors (1150965).

1222155 is a wasteful number, since it uses less digits than its factorization.

1222155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 842 counting only the distinct ones).

The product of its digits is 200, while the sum is 18.

The square root of 1222155 is about 1105.5111939732. The cubic root of 1222155 is about 106.9158508041.

Adding to 1222155 its reverse (5512221), we get a palindrome (6734376).

The spelling of 1222155 in words is "one million, two hundred twenty-two thousand, one hundred fifty-five".