138208086 has 16 divisors (see below), whose sum is σ = 307129200. Its totient is φ = 46069344.

The previous prime is 138208073. The next prime is 138208093. The reversal of 138208086 is 680802831.

138208086 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 138208086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1279651 + ... + 1279758.

It is an arithmetic number, because the mean of its divisors is an integer number (19195575).

Almost surely, 2^138208086 is an apocalyptic number.

138208086 is an abundant number, since it is smaller than the sum of its proper divisors (168921114).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138208086 is a wasteful number, since it uses less digits than its factorization.

138208086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559420 (or 2559414 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 138208086 is about 11756.1935166107. The cubic root of 138208086 is about 517.0245328296.

The spelling of 138208086 in words is "one hundred thirty-eight million, two hundred eight thousand, eighty-six".