1221445 has 8 divisors (see below), whose sum is σ = 1474560. Its totient is φ = 971280.

The previous prime is 1221443. The next prime is 1221449. The reversal of 1221445 is 5441221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1221445 - 2¹ = 1221443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316 + ... + 1594.

It is an arithmetic number, because the mean of its divisors is an integer number (184320).

2^1221445 is an apocalyptic number.

It is an amenable number.

1221445 is a deficient number, since it is larger than the sum of its proper divisors (253115).

1221445 is a wasteful number, since it uses less digits than its factorization.

1221445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its digits is 320, while the sum is 19.

The square root of 1221445 is about 1105.1900289091. The cubic root of 1221445 is about 106.8951428582.

Adding to 1221445 its reverse (5441221), we get a palindrome (6662666).

It can be divided in two parts, 1221 and 445, that multiplied together give a palindrome (543345).

The spelling of 1221445 in words is "one million, two hundred twenty-one thousand, four hundred forty-five".