138538853 has 2 divisors, whose sum is σ = 138538854. Its totient is φ = 138538852.

The previous prime is 138538801. The next prime is 138538879. The reversal of 138538853 is 358835831.

138538853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112508449 + 26030404 = 10607^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 138538853 - 2⁶ = 138538789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138538553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69269426 + 69269427.

It is an arithmetic number, because the mean of its divisors is an integer number (69269427).

Almost surely, 2^138538853 is an apocalyptic number.

It is an amenable number.

138538853 is a deficient number, since it is larger than the sum of its proper divisors (1).

138538853 is an equidigital number, since it uses as much as digits as its factorization.

138538853 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 44.

The square root of 138538853 is about 11770.2528859834. The cubic root of 138538853 is about 517.4366611707.

The spelling of 138538853 in words is "one hundred thirty-eight million, five hundred thirty-eight thousand, eight hundred fifty-three".