1280218 has 4 divisors (see below), whose sum is σ = 1920330. Its totient is φ = 640108.

The previous prime is 1280183. The next prime is 1280221. The reversal of 1280218 is 8120821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8120821 = 131 ⋅61991.

It can be written as a sum of positive squares in only one way, i.e., 751689 + 528529 = 867^2 + 727^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320053 + ... + 320056.

2^1280218 is an apocalyptic number.

1280218 is a deficient number, since it is larger than the sum of its proper divisors (640112).

1280218 is an equidigital number, since it uses as much as digits as its factorization.

1280218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640111.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1280218 is about 1131.4671890956. The cubic root of 1280218 is about 108.5828683039.

The spelling of 1280218 in words is "one million, two hundred eighty thousand, two hundred eighteen".