1440889 has 2 divisors, whose sum is σ = 1440890. Its totient is φ = 1440888.

The previous prime is 1440883. The next prime is 1440913. The reversal of 1440889 is 9880441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1071225 + 369664 = 1035^2 + 608^2 .

It is an emirp because it is prime and its reverse (9880441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1440889 - 2¹⁷ = 1309817 is a prime.

It is a super-2 number, since 2×1440889² = 4152322220642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1440883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720444 + 720445.

It is an arithmetic number, because the mean of its divisors is an integer number (720445).

2^1440889 is an apocalyptic number.

It is an amenable number.

1440889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440889 is an equidigital number, since it uses as much as digits as its factorization.

1440889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1440889 is about 1200.3703595141. The cubic root of 1440889 is about 112.9475570471.

The spelling of 1440889 in words is "one million, four hundred forty thousand, eight hundred eighty-nine".