138277886 has 16 divisors (see below), whose sum is σ = 216687744. Its totient is φ = 66055704.

The previous prime is 138277873. The next prime is 138277897. The reversal of 138277886 is 688772831.

138277886 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67205 + ... + 69231.

It is an arithmetic number, because the mean of its divisors is an integer number (13542984).

Almost surely, 2^138277886 is an apocalyptic number.

138277886 is a deficient number, since it is larger than the sum of its proper divisors (78409858).

138277886 is a wasteful number, since it uses less digits than its factorization.

138277886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3535.

The product of its digits is 903168, while the sum is 50.

The square root of 138277886 is about 11759.1617898556. The cubic root of 138277886 is about 517.1115567751. Note that the first 3 decimals are identical.

The spelling of 138277886 in words is "one hundred thirty-eight million, two hundred seventy-seven thousand, eight hundred eighty-six".