1221272 has 16 divisors (see below), whose sum is σ = 2466240. Its totient is φ = 563616.

The previous prime is 1221251. The next prime is 1221289. The reversal of 1221272 is 2721221.

It is a self number, because there is not a number n which added to its sum of digits gives 1221272.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5768 + ... + 5975.

It is an arithmetic number, because the mean of its divisors is an integer number (154140).

2^1221272 is an apocalyptic number.

It is an amenable number.

1221272 is an abundant number, since it is smaller than the sum of its proper divisors (1244968).

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

1221272 is a wasteful number, since it uses less digits than its factorization.

1221272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11762 (or 11758 counting only the distinct ones).

The product of its digits is 112, while the sum is 17.

The square root of 1221272 is about 1105.1117590543. Note that the first 3 decimals coincide. The cubic root of 1221272 is about 106.8900959035.

Adding to 1221272 its reverse (2721221), we get a palindrome (3942493).

The spelling of 1221272 in words is "one million, two hundred twenty-one thousand, two hundred seventy-two".