138253 has 4 divisors (see below), whose sum is σ = 144288.
Its totient is φ = 132220.
The previous prime is 138251. The next prime is 138283. The reversal of 138253 is 352831.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 138253 - 21 = 138251 is a prime.
It is a super-2 number, since 2×1382532 = 38227784018, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (138251) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2983 + ... + 3028.
It is an arithmetic number, because the mean of its divisors is an integer number (36072).
2138253 is an apocalyptic number.
It is an amenable number.
138253 is a deficient number, since it is larger than the sum of its proper divisors (6035).
138253 is an equidigital number, since it uses as much as digits as its factorization.
138253 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6034.
The product of its digits is 720, while the sum is 22.
The square root of 138253 is about 371.8238830414.
The cubic root of 138253 is about 51.7080533231.
The spelling of 138253 in words is "one hundred thirty-eight thousand, two hundred fifty-three".