1389389 has 4 divisors (see below), whose sum is σ = 1434240. Its totient is φ = 1344540.

The previous prime is 1389383. The next prime is 1389403. The reversal of 1389389 is 9839831.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9839831 = 359 ⋅27409.

It is a cyclic number.

It is not a de Polignac number, because 1389389 - 2⁸ = 1389133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389383) 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 3 ways as a sum of consecutive naturals, for example, 22379 + ... + 22440.

It is an arithmetic number, because the mean of its divisors is an integer number (358560).

2^1389389 is an apocalyptic number.

It is an amenable number.

1389389 is a deficient number, since it is larger than the sum of its proper divisors (44851).

1389389 is an equidigital number, since it uses as much as digits as its factorization.

1389389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44850.

The product of its digits is 46656, while the sum is 41.

The square root of 1389389 is about 1178.7234620555. The cubic root of 1389389 is about 111.5855483743.

The spelling of 1389389 in words is "one million, three hundred eighty-nine thousand, three hundred eighty-nine".