1440336221 has 2 divisors, whose sum is σ = 1440336222. Its totient is φ = 1440336220.

The previous prime is 1440336193. The next prime is 1440336263. The reversal of 1440336221 is 1226330441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1248208900 + 192127321 = 35330^2 + 13861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440336221 - 2²⁶ = 1373227357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440339221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720168110 + 720168111.

It is an arithmetic number, because the mean of its divisors is an integer number (720168111).

Almost surely, 2^1440336221 is an apocalyptic number.

It is an amenable number.

1440336221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440336221 is an equidigital number, since it uses as much as digits as its factorization.

1440336221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 1440336221 is about 37951.7617641131. The cubic root of 1440336221 is about 1129.3311156164.

Adding to 1440336221 its reverse (1226330441), we get a palindrome (2666666662).

The spelling of 1440336221 in words is "one billion, four hundred forty million, three hundred thirty-six thousand, two hundred twenty-one".