268138 has 8 divisors (see below), whose sum is σ = 433188. Its totient is φ = 123744.

The previous prime is 268133. The next prime is 268153. The reversal of 268138 is 831862.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 15129 = 503^2 + 123^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (268133) by changing a digit.

268138 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5131 + ... + 5182.

2²⁶⁸¹³⁸ is an apocalyptic number.

268138 is a deficient number, since it is larger than the sum of its proper divisors (165050).

268138 is a wasteful number, since it uses less digits than its factorization.

268138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10328.

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

The square root of 268138 is about 517.8204321963. The cubic root of 268138 is about 64.4841216448.

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

The spelling of 268138 in words is "two hundred sixty-eight thousand, one hundred thirty-eight".