138777775 has 6 divisors (see below), whose sum is σ = 172084472. Its totient is φ = 111022200.

The previous prime is 138777773. The next prime is 138777781. The reversal of 138777775 is 577777831.

It is not a de Polignac number, because 138777775 - 2¹ = 138777773 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 (138777773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2775531 + ... + 2775580.

Almost surely, 2^138777775 is an apocalyptic number.

138777775 is a deficient number, since it is larger than the sum of its proper divisors (33306697).

138777775 is an equidigital number, since it uses as much as digits as its factorization.

138777775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5551121 (or 5551116 counting only the distinct ones).

The product of its digits is 2016840, while the sum is 52.

The square root of 138777775 is about 11780.3979134832. The cubic root of 138777775 is about 517.7339448060.

The spelling of 138777775 in words is "one hundred thirty-eight million, seven hundred seventy-seven thousand, seven hundred seventy-five".