1440839 has 4 divisors (see below), whose sum is σ = 1465320. Its totient is φ = 1416360.

The previous prime is 1440823. The next prime is 1440847. The reversal of 1440839 is 9380441.

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

It is a cyclic number.

It is not a de Polignac number, because 1440839 - 2⁴ = 1440823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1440889) 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, 12152 + ... + 12269.

It is an arithmetic number, because the mean of its divisors is an integer number (366330).

2^1440839 is an apocalyptic number.

1440839 is a deficient number, since it is larger than the sum of its proper divisors (24481).

1440839 is an equidigital number, since it uses as much as digits as its factorization.

1440839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24480.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1440839 is about 1200.3495324280. The cubic root of 1440839 is about 112.9462505752.

The spelling of 1440839 in words is "one million, four hundred forty thousand, eight hundred thirty-nine".