138286 has 4 divisors (see below), whose sum is σ = 207432. Its totient is φ = 69142.

The previous prime is 138283. The next prime is 138289. The reversal of 138286 is 682831.

138286 is nontrivially palindromic in base 7.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 682831 = 173 ⋅3947.

It is an interprime number because it is at equal distance from previous prime (138283) and next prime (138289).

It is a super-3 number, since 3×138286³ = 7933336916812968, which contains 333 as substring.

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 as a sum of consecutive naturals, namely, 34570 + ... + 34573.

It is an arithmetic number, because the mean of its divisors is an integer number (51858).

2¹³⁸²⁸⁶ is an apocalyptic number.

138286 is a deficient number, since it is larger than the sum of its proper divisors (69146).

138286 is an equidigital number, since it uses as much as digits as its factorization.

138286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69145.

The product of its digits is 2304, while the sum is 28.

The square root of 138286 is about 371.8682562414. The cubic root of 138286 is about 51.7121671097.

It can be divided in two parts, 138 and 286, that added together give a palindrome (424).

The spelling of 138286 in words is "one hundred thirty-eight thousand, two hundred eighty-six".