138771775 has 6 divisors (see below), whose sum is σ = 172077032. Its totient is φ = 111017400.

The previous prime is 138771761. The next prime is 138771781. The reversal of 138771775 is 577177831.

It is a de Polignac number, because none of the positive numbers 2^k-138771775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2775411 + ... + 2775460.

Almost surely, 2^138771775 is an apocalyptic number.

138771775 is a deficient number, since it is larger than the sum of its proper divisors (33305257).

138771775 is an equidigital number, since it uses as much as digits as its factorization.

138771775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550881 (or 5550876 counting only the distinct ones).

The product of its digits is 288120, while the sum is 46.

The square root of 138771775 is about 11780.1432504023. The cubic root of 138771775 is about 517.7264833604.

The spelling of 138771775 in words is "one hundred thirty-eight million, seven hundred seventy-one thousand, seven hundred seventy-five".