1389889 has 4 divisors (see below), whose sum is σ = 1422256. Its totient is φ = 1357524.

The previous prime is 1389887. The next prime is 1389893. The reversal of 1389889 is 9889831.

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: 9889831 = 7 ⋅1412833.

It is a cyclic number.

It is not a de Polignac number, because 1389889 - 2¹ = 1389887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389887) 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, 16119 + ... + 16204.

It is an arithmetic number, because the mean of its divisors is an integer number (355564).

2^1389889 is an apocalyptic number.

It is an amenable number.

1389889 is a deficient number, since it is larger than the sum of its proper divisors (32367).

1389889 is an equidigital number, since it uses as much as digits as its factorization.

1389889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32366.

The product of its digits is 124416, while the sum is 46.

The square root of 1389889 is about 1178.9355368297. The cubic root of 1389889 is about 111.5989322149.

It can be divided in two parts, 1389 and 889, that added together give a triangular number (2278 = T₆₇).

The spelling of 1389889 in words is "one million, three hundred eighty-nine thousand, eight hundred eighty-nine".