1280417 has 2 divisors, whose sum is σ = 1280418. Its totient is φ = 1280416.

The previous prime is 1280407. The next prime is 1280431. The reversal of 1280417 is 7140821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1274641 + 5776 = 1129^2 + 76^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280417 - 2⁴ = 1280401 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1280392 and 1280401.

It is not a weakly prime, because it can be changed into another prime (1280407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640208 + 640209.

It is an arithmetic number, because the mean of its divisors is an integer number (640209).

2^1280417 is an apocalyptic number.

It is an amenable number.

1280417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1280417 is an equidigital number, since it uses as much as digits as its factorization.

1280417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1280417 is about 1131.5551245962. Note that the first 3 decimals coincide. The cubic root of 1280417 is about 108.5884941351.

It can be divided in two parts, 12804 and 17, that added together give a palindrome (12821).

The spelling of 1280417 in words is "one million, two hundred eighty thousand, four hundred seventeen".