1286221 has 4 divisors (see below), whose sum is σ = 1327744. Its totient is φ = 1244700.

The previous prime is 1286209. The next prime is 1286227. The reversal of 1286221 is 1226821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1286221 - 2⁵ = 1286189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1286192 and 1286201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286227) 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, 20715 + ... + 20776.

It is an arithmetic number, because the mean of its divisors is an integer number (331936).

2^1286221 is an apocalyptic number.

It is an amenable number.

1286221 is a deficient number, since it is larger than the sum of its proper divisors (41523).

1286221 is an equidigital number, since it uses as much as digits as its factorization.

1286221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41522.

The product of its digits is 384, while the sum is 22.

The square root of 1286221 is about 1134.1168370146. The cubic root of 1286221 is about 108.7523203803.

The spelling of 1286221 in words is "one million, two hundred eighty-six thousand, two hundred twenty-one".