1389009 has 4 divisors (see below), whose sum is σ = 1852016. Its totient is φ = 926004.

The previous prime is 1389007. The next prime is 1389083. The reversal of 1389009 is 9009831.

It is a happy number.

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 not a de Polignac number, because 1389009 - 2¹ = 1389007 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

1389009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1389001) 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, 231499 + ... + 231504.

It is an arithmetic number, because the mean of its divisors is an integer number (463004).

2^1389009 is an apocalyptic number.

It is an amenable number.

1389009 is a deficient number, since it is larger than the sum of its proper divisors (463007).

1389009 is an equidigital number, since it uses as much as digits as its factorization.

1389009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463006.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1389009 is about 1178.5622597046. The cubic root of 1389009 is about 111.5753745077.

The spelling of 1389009 in words is "one million, three hundred eighty-nine thousand, nine".