1421824 has 20 divisors (see below), whose sum is σ = 2841894. Its totient is φ = 710656.

The previous prime is 1421813. The next prime is 1421857. The reversal of 1421824 is 4281241.

It can be written as a sum of positive squares in only one way, i.e., 1364224 + 57600 = 1168^2 + 240^2 .

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a nialpdrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 1421795 and 1421804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 877 + ... + 1900.

2^1421824 is an apocalyptic number.

It is an amenable number.

1421824 is a deficient number, since it is larger than the sum of its proper divisors (1420070).

1421824 is an frugal number, since it uses more digits than its factorization.

1421824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795 (or 2779 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 1421824 is about 1192.4026165687. The cubic root of 1421824 is about 112.4471916762.

The spelling of 1421824 in words is "one million, four hundred twenty-one thousand, eight hundred twenty-four".