1221417 has 12 divisors (see below), whose sum is σ = 1781364. Its totient is φ = 806400.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221417 is 7141221.

It can be written as a sum of positive squares in 2 ways, for example, as 9216 + 1212201 = 96^2 + 1101^2 .

It is not a de Polignac number, because 1221417 - 2⁷ = 1221289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221417.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (148447).

2^1221417 is an apocalyptic number.

It is an amenable number.

1221417 is a deficient number, since it is larger than the sum of its proper divisors (559947).

1221417 is a wasteful number, since it uses less digits than its factorization.

1221417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320 (or 1317 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1221417 is about 1105.1773613317. The cubic root of 1221417 is about 106.8943260424.

Adding to 1221417 its reverse (7141221), we get a palindrome (8362638).

The spelling of 1221417 in words is "one million, two hundred twenty-one thousand, four hundred seventeen".