1221286 has 16 divisors (see below), whose sum is σ = 2046528. Its totient is φ = 541800.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221286 is 6821221.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (127908).

2^1221286 is an apocalyptic number.

1221286 is a deficient number, since it is larger than the sum of its proper divisors (825242).

1221286 is a wasteful number, since it uses less digits than its factorization.

1221286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347.

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

The square root of 1221286 is about 1105.1180932371. The cubic root of 1221286 is about 106.8905043453.

The spelling of 1221286 in words is "one million, two hundred twenty-one thousand, two hundred eighty-six".