1228158 has 36 divisors (see below), whose sum is σ = 2788344. Its totient is φ = 390600.

The previous prime is 1228153. The next prime is 1228159. The reversal of 1228158 is 8518221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228153) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17263 + ... + 17333.

It is an arithmetic number, because the mean of its divisors is an integer number (77454).

2^1228158 is an apocalyptic number.

1228158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1228158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1394172).

1228158 is an abundant number, since it is smaller than the sum of its proper divisors (1560186).

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

1228158 is a wasteful number, since it uses less digits than its factorization.

1228158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 107 counting only the distinct ones).

The product of its digits is 1280, while the sum is 27.

The square root of 1228158 is about 1108.2229017666. Note that the first 3 decimals coincide. The cubic root of 1228158 is about 107.0906152934.

The spelling of 1228158 in words is "one million, two hundred twenty-eight thousand, one hundred fifty-eight".