138799 has 2 divisors, whose sum is σ = 138800. Its totient is φ = 138798.

The previous prime is 138797. The next prime is 138821. The reversal of 138799 is 997831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138799 - 2¹ = 138797 is a prime.

Together with 138797, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 1 + 3⁹ + 7⁶ + 8 + 9³ + 9³ .

138799 is a lucky number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69399 + 69400.

It is an arithmetic number, because the mean of its divisors is an integer number (69400).

2¹³⁸⁷⁹⁹ is an apocalyptic number.

138799 is a deficient number, since it is larger than the sum of its proper divisors (1).

138799 is an equidigital number, since it uses as much as digits as its factorization.

138799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 138799 is about 372.5573781312. The cubic root of 138799 is about 51.7760337944.

The spelling of 138799 in words is "one hundred thirty-eight thousand, seven hundred ninety-nine".