1228789 has 2 divisors, whose sum is σ = 1228790. Its totient is φ = 1228788.

The previous prime is 1228783. The next prime is 1228837. The reversal of 1228789 is 9878221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 828100 + 400689 = 910^2 + 633^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228789 - 2⁹ = 1228277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614394 + 614395.

It is an arithmetic number, because the mean of its divisors is an integer number (614395).

2^1228789 is an apocalyptic number.

It is an amenable number.

1228789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228789 is an equidigital number, since it uses as much as digits as its factorization.

1228789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 1228789 is about 1108.5075552291. The cubic root of 1228789 is about 107.1089524044.

It can be divided in two parts, 122 and 8789, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 1228789 in words is "one million, two hundred twenty-eight thousand, seven hundred eighty-nine".