138869 has 2 divisors, whose sum is σ = 138870. Its totient is φ = 138868.

The previous prime is 138863. The next prime is 138883. The reversal of 138869 is 968831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70225 + 68644 = 265^2 + 262^2 .

It is an emirp because it is prime and its reverse (968831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138869 is a prime.

It is a super-2 number, since 2×138869² = 38569198322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 138869.

It is not a weakly prime, because it can be changed into another prime (138863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69434 + 69435.

It is an arithmetic number, because the mean of its divisors is an integer number (69435).

2¹³⁸⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

138869 is a deficient number, since it is larger than the sum of its proper divisors (1).

138869 is an equidigital number, since it uses as much as digits as its factorization.

138869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 35.

The square root of 138869 is about 372.6513115501. The cubic root of 138869 is about 51.7847363385.

The spelling of 138869 in words is "one hundred thirty-eight thousand, eight hundred sixty-nine".