1440221 has 4 divisors (see below), whose sum is σ = 1470912. Its totient is φ = 1409532.

The previous prime is 1440211. The next prime is 1440233. The reversal of 1440221 is 1220441.

1440221 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1220441 = 701 ⋅1741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1440196 and 1440205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15275 + ... + 15368.

It is an arithmetic number, because the mean of its divisors is an integer number (367728).

2^1440221 is an apocalyptic number.

It is an amenable number.

1440221 is a deficient number, since it is larger than the sum of its proper divisors (30691).

1440221 is an equidigital number, since it uses as much as digits as its factorization.

1440221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30690.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1440221 is about 1200.0920798005. The cubic root of 1440221 is about 112.9301000858.

Adding to 1440221 its reverse (1220441), we get a palindrome (2660662).

It can be divided in two parts, 1440 and 221, that added together give a palindrome (1661).

The spelling of 1440221 in words is "one million, four hundred forty thousand, two hundred twenty-one".