138247 has 2 divisors, whose sum is σ = 138248. Its totient is φ = 138246.

The previous prime is 138241. The next prime is 138251. The reversal of 138247 is 742831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138247 - 2³ = 138239 is a prime.

It is a super-2 number, since 2×138247² = 38224466018, which contains 22 as substring.

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 138247.

It is not a weakly prime, because it can be changed into another prime (138241) 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, 69123 + 69124.

It is an arithmetic number, because the mean of its divisors is an integer number (69124).

2¹³⁸²⁴⁷ is an apocalyptic number.

138247 is a deficient number, since it is larger than the sum of its proper divisors (1).

138247 is an equidigital number, since it uses as much as digits as its factorization.

138247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 25.

The square root of 138247 is about 371.8158146179. The cubic root of 138247 is about 51.7073052916.

It can be divided in two parts, 13824 and 7, that added together give a palindrome (13831).

The spelling of 138247 in words is "one hundred thirty-eight thousand, two hundred forty-seven".