138386 has 4 divisors (see below), whose sum is σ = 207582. Its totient is φ = 69192.

The previous prime is 138373. The next prime is 138389. The reversal of 138386 is 683831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 32761 = 325^2 + 181^2 .

It is not an unprimeable number, because it can be changed into a prime (138389) 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, 34595 + ... + 34598.

2¹³⁸³⁸⁶ is an apocalyptic number.

138386 is a deficient number, since it is larger than the sum of its proper divisors (69196).

138386 is an equidigital number, since it uses as much as digits as its factorization.

138386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69195.

The product of its digits is 3456, while the sum is 29.

The square root of 138386 is about 372.0026881623. The cubic root of 138386 is about 51.7246291345.

It can be divided in two parts, 13838 and 6, that multiplied together give a triangular number (83028 = T₄₀₇).

The spelling of 138386 in words is "one hundred thirty-eight thousand, three hundred eighty-six".