138473253 has 8 divisors (see below), whose sum is σ = 205145600. Its totient is φ = 92315484.

The previous prime is 138473243. The next prime is 138473297. The reversal of 138473253 is 352374831.

138473253 is a `hidden beast` number, since 138 + 473 + 2 + 53 = 666.

It is not a de Polignac number, because 138473253 - 2¹⁸ = 138211109 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 (138473243) 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, 2564293 + ... + 2564346.

It is an arithmetic number, because the mean of its divisors is an integer number (25643200).

Almost surely, 2^138473253 is an apocalyptic number.

It is an amenable number.

138473253 is a deficient number, since it is larger than the sum of its proper divisors (66672347).

138473253 is an equidigital number, since it uses as much as digits as its factorization.

138473253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128648 (or 5128642 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 138473253 is about 11767.4658699314. The cubic root of 138473253 is about 517.3549772164.

The spelling of 138473253 in words is "one hundred thirty-eight million, four hundred seventy-three thousand, two hundred fifty-three".