1228142 has 4 divisors (see below), whose sum is σ = 1842216.
Its totient is φ = 614070.
The previous prime is 1228133. The next prime is 1228147. The reversal of 1228142 is 2418221.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is an Ulam number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1228147) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307034 + ... + 307037.
It is an arithmetic number, because the mean of its divisors is an integer number (460554).
21228142 is an apocalyptic number.
1228142 is a deficient number, since it is larger than the sum of its proper divisors (614074).
1228142 is an equidigital number, since it uses as much as digits as its factorization.
1228142 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 614073.
The product of its digits is 256, while the sum is 20.
The square root of 1228142 is about 1108.2156829787.
The cubic root of 1228142 is about 107.0901502454.
The spelling of 1228142 in words is "one million, two hundred twenty-eight thousand, one hundred forty-two".