138653 has 4 divisors (see below), whose sum is σ = 140988. Its totient is φ = 136320.

The previous prime is 138647. The next prime is 138661. The reversal of 138653 is 356831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58564 + 80089 = 242^2 + 283^2 .

It is a cyclic number.

It is not a de Polignac number, because 138653 - 2⁴ = 138637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076 + ... + 1197.

It is an arithmetic number, because the mean of its divisors is an integer number (35247).

2¹³⁸⁶⁵³ is an apocalyptic number.

It is an amenable number.

138653 is a deficient number, since it is larger than the sum of its proper divisors (2335).

138653 is an equidigital number, since it uses as much as digits as its factorization.

138653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2334.

The product of its digits is 2160, while the sum is 26.

The square root of 138653 is about 372.3613836047. The cubic root of 138653 is about 51.7578733538.

The spelling of 138653 in words is "one hundred thirty-eight thousand, six hundred fifty-three".