138208077 has 24 divisors (see below), whose sum is σ = 232814400. Its totient is φ = 78974280.

The previous prime is 138208073. The next prime is 138208093. The reversal of 138208077 is 770802831.

138208077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138208077 - 2² = 138208073 is a prime.

It is a super-3 number, since 3×138208077³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138208073) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19299 + ... + 25472.

It is an arithmetic number, because the mean of its divisors is an integer number (9700600).

Almost surely, 2^138208077 is an apocalyptic number.

It is an amenable number.

138208077 is a deficient number, since it is larger than the sum of its proper divisors (94606323).

138208077 is an equidigital number, since it uses as much as digits as its factorization.

138208077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44798 (or 44781 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 138208077 is about 11756.1931338338. The cubic root of 138208077 is about 517.0245216069.

The spelling of 138208077 in words is "one hundred thirty-eight million, two hundred eight thousand, seventy-seven".