1440438221 has 2 divisors, whose sum is σ = 1440438222. Its totient is φ = 1440438220.

The previous prime is 1440438179. The next prime is 1440438269. The reversal of 1440438221 is 1228340441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1345862596 + 94575625 = 36686^2 + 9725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440438221 - 2¹⁴ = 1440421837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440438721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720219110 + 720219111.

It is an arithmetic number, because the mean of its divisors is an integer number (720219111).

Almost surely, 2^1440438221 is an apocalyptic number.

It is an amenable number.

1440438221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440438221 is an equidigital number, since it uses as much as digits as its factorization.

1440438221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 1440438221 is about 37953.1055514565. The cubic root of 1440438221 is about 1129.3577735252.

Adding to 1440438221 its reverse (1228340441), we get a palindrome (2668778662).

It can be divided in two parts, 14404 and 38221, that added together give a palindrome (52625).

The spelling of 1440438221 in words is "one billion, four hundred forty million, four hundred thirty-eight thousand, two hundred twenty-one".