138245 has 8 divisors (see below), whose sum is σ = 170016. Its totient is φ = 107856.

The previous prime is 138241. The next prime is 138247. The reversal of 138245 is 542831.

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

It is a cyclic number.

It is not a de Polignac number, because 138245 - 2² = 138241 is a prime.

It is a super-2 number, since 2×138245² = 38223360050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (21252).

2¹³⁸²⁴⁵ is an apocalyptic number.

138245 is the 215-th octagonal number.

It is an amenable number.

138245 is a deficient number, since it is larger than the sum of its proper divisors (31771).

138245 is an equidigital number, since it uses as much as digits as its factorization.

138245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691.

The product of its digits is 960, while the sum is 23.

The square root of 138245 is about 371.8131251045. The cubic root of 138245 is about 51.7070559429.

It can be divided in two parts, 138 and 245, that added together give a palindrome (383).

The spelling of 138245 in words is "one hundred thirty-eight thousand, two hundred forty-five".