138287 has 4 divisors (see below), whose sum is σ = 140616. Its totient is φ = 135960.

The previous prime is 138283. The next prime is 138289. The reversal of 138287 is 782831.

138287 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782831 = 7 ⋅111833.

It is a cyclic number.

It is not a de Polignac number, because 138287 - 2² = 138283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1073 + ... + 1194.

It is an arithmetic number, because the mean of its divisors is an integer number (35154).

2¹³⁸²⁸⁷ is an apocalyptic number.

138287 is a deficient number, since it is larger than the sum of its proper divisors (2329).

138287 is an equidigital number, since it uses as much as digits as its factorization.

138287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its digits is 2688, while the sum is 29.

The square root of 138287 is about 371.8696008011. The cubic root of 138287 is about 51.7122917597.

The spelling of 138287 in words is "one hundred thirty-eight thousand, two hundred eighty-seven".