138146 has 4 divisors (see below), whose sum is σ = 207222. Its totient is φ = 69072.

The previous prime is 138143. The next prime is 138157. The reversal of 138146 is 641831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 641831 = 661 ⋅971.

It can be written as a sum of positive squares in only one way, i.e., 112225 + 25921 = 335^2 + 161^2 .

It is an Ulam number.

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 34535 + ... + 34538.

2¹³⁸¹⁴⁶ is an apocalyptic number.

138146 is a deficient number, since it is larger than the sum of its proper divisors (69076).

138146 is an equidigital number, since it uses as much as digits as its factorization.

138146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69075.

The product of its digits is 576, while the sum is 23.

The square root of 138146 is about 371.6799698666. The cubic root of 138146 is about 51.6947101776.

Adding to 138146 its reverse (641831), we get a palindrome (779977).

The spelling of 138146 in words is "one hundred thirty-eight thousand, one hundred forty-six".