138571775 has 12 divisors (see below), whose sum is σ = 173603472. Its totient is φ = 109712640.

The previous prime is 138571751. The next prime is 138571781. The reversal of 138571775 is 577175831.

It is not a de Polignac number, because 138571775 - 2²² = 134377471 is a prime.

It is a super-3 number, since 3×138571775³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26147 + ... + 30996.

It is an arithmetic number, because the mean of its divisors is an integer number (14466956).

Almost surely, 2^138571775 is an apocalyptic number.

138571775 is a deficient number, since it is larger than the sum of its proper divisors (35031697).

138571775 is an equidigital number, since it uses as much as digits as its factorization.

138571775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57250 (or 57245 counting only the distinct ones).

The product of its digits is 205800, while the sum is 44.

The square root of 138571775 is about 11771.6513285095. The cubic root of 138571775 is about 517.4776453427.

The spelling of 138571775 in words is "one hundred thirty-eight million, five hundred seventy-one thousand, seven hundred seventy-five".