1421224 has 32 divisors (see below), whose sum is σ = 3124800. Its totient is φ = 593280.

The previous prime is 1421221. The next prime is 1421227. The reversal of 1421224 is 4221241.

It is an interprime number because it is at equal distance from previous prime (1421221) and next prime (1421227).

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

It is a junction number, because it is equal to n+sod(n) for n = 1421198 and 1421207.

It is not an unprimeable number, because it can be changed into a prime (1421221) 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, 1987 + ... + 2605.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2^1421224 is an apocalyptic number.

1421224 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 1421224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562400).

1421224 is an abundant number, since it is smaller than the sum of its proper divisors (1703576).

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

1421224 is a wasteful number, since it uses less digits than its factorization.

1421224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 669 counting only the distinct ones).

The product of its digits is 128, while the sum is 16.

The square root of 1421224 is about 1192.1509971476. The cubic root of 1421224 is about 112.4313721355.

Adding to 1421224 its reverse (4221241), we get a palindrome (5642465).

The spelling of 1421224 in words is "one million, four hundred twenty-one thousand, two hundred twenty-four".