1228145 has 4 divisors (see below), whose sum is σ = 1473780. Its totient is φ = 982512.

The previous prime is 1228133. The next prime is 1228147. The reversal of 1228145 is 5418221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 753424 + 474721 = 868^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228145 - 2¹⁴ = 1211761 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1228145.

It is not an unprimeable number, because it can be changed into a prime (1228147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122810 + ... + 122819.

It is an arithmetic number, because the mean of its divisors is an integer number (368445).

2^1228145 is an apocalyptic number.

It is an amenable number.

1228145 is a deficient number, since it is larger than the sum of its proper divisors (245635).

1228145 is an equidigital number, since it uses as much as digits as its factorization.

1228145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245634.

The product of its digits is 640, while the sum is 23.

The square root of 1228145 is about 1108.2170365050. The cubic root of 1228145 is about 107.0902374422.

The spelling of 1228145 in words is "one million, two hundred twenty-eight thousand, one hundred forty-five".