1221444 has 72 divisors (see below), whose sum is σ = 3651648. Its totient is φ = 336960.

The previous prime is 1221443. The next prime is 1221449. The reversal of 1221444 is 4441221.

1221444 is a `hidden beast` number, since 1 + 221 + 444 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

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 23 ways as a sum of consecutive naturals, for example, 9259 + ... + 9389.

2^1221444 is an apocalyptic number.

1221444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1825824).

1221444 is an abundant number, since it is smaller than the sum of its proper divisors (2430204).

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

1221444 is a wasteful number, since it uses less digits than its factorization.

1221444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 180 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 1221444 is about 1105.1895764981. The cubic root of 1221444 is about 106.8951136864.

Adding to 1221444 its reverse (4441221), we get a palindrome (5662665).

It can be divided in two parts, 1 and 221444, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 1221444 in words is "one million, two hundred twenty-one thousand, four hundred forty-four".