1380389 has 2 divisors, whose sum is σ = 1380390. Its totient is φ = 1380388.

The previous prime is 1380377. The next prime is 1380397. The reversal of 1380389 is 9830831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 588289 = 890^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 1380389 - 2¹⁶ = 1314853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1380319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 690194 + 690195.

It is an arithmetic number, because the mean of its divisors is an integer number (690195).

2^1380389 is an apocalyptic number.

It is an amenable number.

1380389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1380389 is an equidigital number, since it uses as much as digits as its factorization.

1380389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1380389 is about 1174.8995701761. The cubic root of 1380389 is about 111.3440882276.

The spelling of 1380389 in words is "one million, three hundred eighty thousand, three hundred eighty-nine".