1211304 has 32 divisors (see below), whose sum is σ = 3104640. Its totient is φ = 393600.

The previous prime is 1211303. The next prime is 1211311. The reversal of 1211304 is 4031121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1211304.

It is not an unprimeable number, because it can be changed into a prime (1211303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 1599.

It is an arithmetic number, because the mean of its divisors is an integer number (97020).

2^1211304 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 1211304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1552320).

1211304 is an abundant number, since it is smaller than the sum of its proper divisors (1893336).

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

1211304 is a wasteful number, since it uses less digits than its factorization.

1211304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281 (or 1277 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1211304 is about 1100.5925676653. The cubic root of 1211304 is about 106.5984894191.

Adding to 1211304 its reverse (4031121), we get a palindrome (5242425).

The spelling of 1211304 in words is "one million, two hundred eleven thousand, three hundred four".