138899 has 2 divisors, whose sum is σ = 138900.
Its totient is φ = 138898.
The previous prime is 138893. The next prime is 138917. The reversal of 138899 is 998831.
Adding to 138899 its product of digits (15552), we get a palindrome (154451).
138899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a weak prime.
It is an emirp because it is prime and its reverse (998831) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 138899 - 24 = 138883 is a prime.
It is a Chen prime.
It is an Ulam number.
It is a plaindrome in base 10.
It is not a weakly prime, because it can be changed into another prime (138893) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69449 + 69450.
It is an arithmetic number, because the mean of its divisors is an integer number (69450).
2138899 is an apocalyptic number.
138899 is a deficient number, since it is larger than the sum of its proper divisors (1).
138899 is an equidigital number, since it uses as much as digits as its factorization.
138899 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 15552, while the sum is 38.
The square root of 138899 is about 372.6915614821.
The cubic root of 138899 is about 51.7884651050.
The spelling of 138899 in words is "one hundred thirty-eight thousand, eight hundred ninety-nine".