1440689 has 2 divisors, whose sum is σ = 1440690. Its totient is φ = 1440688.

The previous prime is 1440679. The next prime is 1440707. The reversal of 1440689 is 9860441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 824464 + 616225 = 908^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440689 - 2¹² = 1436593 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1440619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720344 + 720345.

It is an arithmetic number, because the mean of its divisors is an integer number (720345).

2^1440689 is an apocalyptic number.

It is an amenable number.

1440689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440689 is an equidigital number, since it uses as much as digits as its factorization.

1440689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 1440689 is about 1200.2870490012. The cubic root of 1440689 is about 112.9423309780.

The spelling of 1440689 in words is "one million, four hundred forty thousand, six hundred eighty-nine".