1221236 has 12 divisors (see below), whose sum is σ = 2157540. Its totient is φ = 604800.

The previous prime is 1221223. The next prime is 1221239. The reversal of 1221236 is 6321221.

It can be written as a sum of positive squares in 2 ways, for example, as 739600 + 481636 = 860^2 + 694^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221239) 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, 965 + ... + 1836.

It is an arithmetic number, because the mean of its divisors is an integer number (179795).

2^1221236 is an apocalyptic number.

It is an amenable number.

1221236 is a deficient number, since it is larger than the sum of its proper divisors (936304).

1221236 is a wasteful number, since it uses less digits than its factorization.

1221236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914 (or 2912 counting only the distinct ones).

The product of its digits is 144, while the sum is 17.

The square root of 1221236 is about 1105.0954709888. The cubic root of 1221236 is about 106.8890456102.

Adding to 1221236 its reverse (6321221), we get a palindrome (7542457).

The spelling of 1221236 in words is "one million, two hundred twenty-one thousand, two hundred thirty-six".