138647 has 2 divisors, whose sum is σ = 138648. Its totient is φ = 138646.

The previous prime is 138641. The next prime is 138661. The reversal of 138647 is 746831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138647 - 2¹⁰ = 137623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69323 + 69324.

It is an arithmetic number, because the mean of its divisors is an integer number (69324).

2¹³⁸⁶⁴⁷ is an apocalyptic number.

138647 is a deficient number, since it is larger than the sum of its proper divisors (1).

138647 is an equidigital number, since it uses as much as digits as its factorization.

138647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 29.

The square root of 138647 is about 372.3533268282. The cubic root of 138647 is about 51.7571267617.

The spelling of 138647 in words is "one hundred thirty-eight thousand, six hundred forty-seven".