1221276 has 72 divisors (see below), whose sum is σ = 3472896. Its totient is φ = 332640.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221276 is 6721221.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18195 + ... + 18261.

2^1221276 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 1221276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1736448).

1221276 is an abundant number, since it is smaller than the sum of its proper divisors (2251620).

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

1221276 is a wasteful number, since it uses less digits than its factorization.

1221276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119 (or 110 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 1221276 is about 1105.1135688245. The cubic root of 1221276 is about 106.8902126015.

Adding to 1221276 its reverse (6721221), we get a palindrome (7942497).

Subtracting 1221276 from its reverse (6721221), we obtain a palindrome (5499945).

The spelling of 1221276 in words is "one million, two hundred twenty-one thousand, two hundred seventy-six".