1440534221 has 16 divisors (see below), whose sum is σ = 1689461760. Its totient is φ = 1202497920.

The previous prime is 1440534187. The next prime is 1440534239. The reversal of 1440534221 is 1224350441.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440534221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440531221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170075 + ... + 178343.

It is an arithmetic number, because the mean of its divisors is an integer number (105591360).

Almost surely, 2^1440534221 is an apocalyptic number.

It is an amenable number.

1440534221 is a deficient number, since it is larger than the sum of its proper divisors (248927539).

1440534221 is an equidigital number, since it uses as much as digits as its factorization.

1440534221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8924.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1440534221 is about 37954.3702490240. The cubic root of 1440534221 is about 1129.3828621721.

Adding to 1440534221 its reverse (1224350441), we get a palindrome (2664884662).

The spelling of 1440534221 in words is "one billion, four hundred forty million, five hundred thirty-four thousand, two hundred twenty-one".