1222158 has 24 divisors (see below), whose sum is σ = 2844072. Its totient is φ = 349104.

The previous prime is 1222157. The next prime is 1222159. The reversal of 1222158 is 8512221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1222157) and next prime (1222159).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1785 + ... + 2372.

It is an arithmetic number, because the mean of its divisors is an integer number (118503).

2^1222158 is an apocalyptic number.

1222158 is an abundant number, since it is smaller than the sum of its proper divisors (1621914).

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

1222158 is a wasteful number, since it uses less digits than its factorization.

1222158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4176 (or 4169 counting only the distinct ones).

The product of its digits is 320, while the sum is 21.

The square root of 1222158 is about 1105.5125508107. The cubic root of 1222158 is about 106.9159382854.

Adding to 1222158 its reverse (8512221), we get a palindrome (9734379).

The spelling of 1222158 in words is "one million, two hundred twenty-two thousand, one hundred fifty-eight".