138834557 has 8 divisors (see below), whose sum is σ = 139778232. Its totient is φ = 137894400.

The previous prime is 138834541. The next prime is 138834581. The reversal of 138834557 is 755438831.

It is a happy number.

138834557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6446521 + 132388036 = 2539^2 + 11506^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138834557 - 2⁴ = 138834541 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 (138834587) 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, 182057 + ... + 182817.

It is an arithmetic number, because the mean of its divisors is an integer number (17472279).

Almost surely, 2^138834557 is an apocalyptic number.

It is an amenable number.

138834557 is a deficient number, since it is larger than the sum of its proper divisors (943675).

138834557 is an equidigital number, since it uses as much as digits as its factorization.

138834557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its digits is 403200, while the sum is 44.

The square root of 138834557 is about 11782.8076874742. The cubic root of 138834557 is about 517.8045467937.

The spelling of 138834557 in words is "one hundred thirty-eight million, eight hundred thirty-four thousand, five hundred fifty-seven".