1440270721 has 2 divisors, whose sum is σ = 1440270722. Its totient is φ = 1440270720.

The previous prime is 1440270709. The next prime is 1440270739. The reversal of 1440270721 is 1270720441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 942490000 + 497780721 = 30700^2 + 22311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440270721 - 2⁷ = 1440270593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1440270721.

It is not a weakly prime, because it can be changed into another prime (1440270781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720135360 + 720135361.

It is an arithmetic number, because the mean of its divisors is an integer number (720135361).

Almost surely, 2^1440270721 is an apocalyptic number.

It is an amenable number.

1440270721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440270721 is an equidigital number, since it uses as much as digits as its factorization.

1440270721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 1440270721 is about 37950.8988167606. The cubic root of 1440270721 is about 1129.3139963938.

The spelling of 1440270721 in words is "one billion, four hundred forty million, two hundred seventy thousand, seven hundred twenty-one".