1221284 has 12 divisors (see below), whose sum is σ = 2145024. Its totient is φ = 608424.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221284 is 4821221.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 1709 + ... + 2315.

It is an arithmetic number, because the mean of its divisors is an integer number (178752).

2^1221284 is an apocalyptic number.

It is an amenable number.

1221284 is a deficient number, since it is larger than the sum of its proper divisors (923740).

1221284 is a wasteful number, since it uses less digits than its factorization.

1221284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114 (or 1112 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

The square root of 1221284 is about 1105.1171883561. The cubic root of 1221284 is about 106.8904459967.

The spelling of 1221284 in words is "one million, two hundred twenty-one thousand, two hundred eighty-four".