138145 has 8 divisors (see below), whose sum is σ = 189504. Its totient is φ = 94704.

The previous prime is 138143. The next prime is 138157. The reversal of 138145 is 541831.

138145 = 113² + 114² + ... + 122².

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 138145 - 2¹ = 138143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138143) 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, 1939 + ... + 2008.

It is an arithmetic number, because the mean of its divisors is an integer number (23688).

2¹³⁸¹⁴⁵ is an apocalyptic number.

It is an amenable number.

138145 is a deficient number, since it is larger than the sum of its proper divisors (51359).

138145 is an equidigital number, since it uses as much as digits as its factorization.

138145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959.

The product of its digits is 480, while the sum is 22.

The square root of 138145 is about 371.6786246208. The cubic root of 138145 is about 51.6945854429.

Adding to 138145 its reverse (541831), we get a palindrome (679976).

The spelling of 138145 in words is "one hundred thirty-eight thousand, one hundred forty-five".