1286489 has 2 divisors, whose sum is σ = 1286490. Its totient is φ = 1286488.

The previous prime is 1286447. The next prime is 1286491. The reversal of 1286489 is 9846821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 43264 = 1115^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1286489 - 2¹⁶ = 1220953 is a prime.

Together with 1286491, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1286419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643244 + 643245.

It is an arithmetic number, because the mean of its divisors is an integer number (643245).

2^1286489 is an apocalyptic number.

It is an amenable number.

1286489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1286489 is an equidigital number, since it uses as much as digits as its factorization.

1286489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 1286489 is about 1134.2349844719. The cubic root of 1286489 is about 108.7598731513.

The spelling of 1286489 in words is "one million, two hundred eighty-six thousand, four hundred eighty-nine".