1321236 has 72 divisors (see below), whose sum is σ = 3931200. Its totient is φ = 373968.

The previous prime is 1321219. The next prime is 1321247. The reversal of 1321236 is 6321231.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12295 + ... + 12401.

It is an arithmetic number, because the mean of its divisors is an integer number (54600).

2^1321236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1965600).

1321236 is an abundant number, since it is smaller than the sum of its proper divisors (2609964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321236 is a wasteful number, since it uses less digits than its factorization.

1321236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138 (or 119 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 1321236 is about 1149.4503034059. The cubic root of 1321236 is about 109.7303588570.

Adding to 1321236 its reverse (6321231), we get a palindrome (7642467).

The spelling of 1321236 in words is "one million, three hundred twenty-one thousand, two hundred thirty-six".