1440039 has 4 divisors (see below), whose sum is σ = 1920056. Its totient is φ = 960024.

The previous prime is 1440037. The next prime is 1440079. The reversal of 1440039 is 9300441.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1440039 - 2¹ = 1440037 is a prime.

It is a D-number.

It is a Duffinian number.

1440039 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1439997 and 1440024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240004 + ... + 240009.

It is an arithmetic number, because the mean of its divisors is an integer number (480014).

2^1440039 is an apocalyptic number.

1440039 is a deficient number, since it is larger than the sum of its proper divisors (480017).

1440039 is an equidigital number, since it uses as much as digits as its factorization.

1440039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480016.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1440039 is about 1200.0162498900. The cubic root of 1440039 is about 112.9253429122.

The spelling of 1440039 in words is "one million, four hundred forty thousand, thirty-nine".