1389439 has 2 divisors, whose sum is σ = 1389440. Its totient is φ = 1389438.

The previous prime is 1389433. The next prime is 1389469. The reversal of 1389439 is 9349831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1389439 - 2³ = 1389431 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1389398 and 1389407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694719 + 694720.

It is an arithmetic number, because the mean of its divisors is an integer number (694720).

2^1389439 is an apocalyptic number.

1389439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389439 is an equidigital number, since it uses as much as digits as its factorization.

1389439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 37.

The square root of 1389439 is about 1178.7446712499. The cubic root of 1389439 is about 111.5868869028.

The spelling of 1389439 in words is "one million, three hundred eighty-nine thousand, four hundred thirty-nine".