1440009 has 6 divisors (see below), whose sum is σ = 2080026. Its totient is φ = 960000.

The previous prime is 1439989. The next prime is 1440011. The reversal of 1440009 is 9000441.

It can be written as a sum of positive squares in only one way, i.e., 1440000 + 9 = 1200^2 + 3^2 .

It is not a de Polignac number, because 1440009 - 2⁷ = 1439881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1439973 and 1440000.

It is not an unprimeable number, because it can be changed into a prime (1440079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79992 + ... + 80009.

It is an arithmetic number, because the mean of its divisors is an integer number (346671).

2^1440009 is an apocalyptic number.

It is an amenable number.

1440009 is a deficient number, since it is larger than the sum of its proper divisors (640017).

1440009 is a wasteful number, since it uses less digits than its factorization.

1440009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160007 (or 160004 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1440009 is about 1200.0037499941. The cubic root of 1440009 is about 112.9245587242.

The spelling of 1440009 in words is "one million, four hundred forty thousand, nine".