138389 has 2 divisors, whose sum is σ = 138390. Its totient is φ = 138388.

The previous prime is 138373. The next prime is 138401. The reversal of 138389 is 983831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84100 + 54289 = 290^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 138389 - 2⁴ = 138373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69194 + 69195.

It is an arithmetic number, because the mean of its divisors is an integer number (69195).

2¹³⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

138389 is a deficient number, since it is larger than the sum of its proper divisors (1).

138389 is an equidigital number, since it uses as much as digits as its factorization.

138389 is an evil number, because the sum of its binary digits is even.

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

The square root of 138389 is about 372.0067203694. The cubic root of 138389 is about 51.7250029025.

The spelling of 138389 in words is "one hundred thirty-eight thousand, three hundred eighty-nine".