1440389 has 4 divisors (see below), whose sum is σ = 1450080. Its totient is φ = 1430700.

The previous prime is 1440379. The next prime is 1440391. The reversal of 1440389 is 9830441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1440389 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 (1440349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4619 + ... + 4920.

It is an arithmetic number, because the mean of its divisors is an integer number (362520).

2^1440389 is an apocalyptic number.

It is an amenable number.

1440389 is a deficient number, since it is larger than the sum of its proper divisors (9691).

1440389 is an equidigital number, since it uses as much as digits as its factorization.

1440389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9690.

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

The square root of 1440389 is about 1200.1620723886. The cubic root of 1440389 is about 112.9344909673.

The spelling of 1440389 in words is "one million, four hundred forty thousand, three hundred eighty-nine".