1421728 has 48 divisors (see below), whose sum is σ = 3495744. Its totient is φ = 552960.

The previous prime is 1421711. The next prime is 1421731. The reversal of 1421728 is 8271241.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2176 + ... + 2752.

It is an arithmetic number, because the mean of its divisors is an integer number (72828).

2^1421728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1747872).

1421728 is an abundant number, since it is smaller than the sum of its proper divisors (2074016).

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

1421728 is a wasteful number, since it uses less digits than its factorization.

1421728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 597 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 1421728 is about 1192.3623610296. The cubic root of 1421728 is about 112.4446608488. Note that the first 3 decimals are identical.

Adding to 1421728 its reverse (8271241), we get a palindrome (9692969).

The spelling of 1421728 in words is "one million, four hundred twenty-one thousand, seven hundred twenty-eight".