138268 has 12 divisors (see below), whose sum is σ = 260680. Its totient is φ = 63792.

The previous prime is 138251. The next prime is 138283. The reversal of 138268 is 862831.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1278 + ... + 1381.

2¹³⁸²⁶⁸ is an apocalyptic number.

It is an amenable number.

138268 is a deficient number, since it is larger than the sum of its proper divisors (122412).

138268 is a wasteful number, since it uses less digits than its factorization.

138268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676 (or 2674 counting only the distinct ones).

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

The square root of 138268 is about 371.8440533342. The cubic root of 138268 is about 51.7099233072.

It can be divided in two parts, 138 and 268, that added together give a triangular number (406 = T₂₈).

The spelling of 138268 in words is "one hundred thirty-eight thousand, two hundred sixty-eight".