138671208 has 48 divisors (see below), whose sum is σ = 404460420. Its totient is φ = 42667776.

The previous prime is 138671201. The next prime is 138671219. The reversal of 138671208 is 802176831.

138671208 is a `hidden beast` number, since 1 + 386 + 71 + 208 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 135908964 + 2762244 = 11658^2 + 1662^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (138671201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73141 + ... + 75012.

Almost surely, 2^138671208 is an apocalyptic number.

138671208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138671208 is an abundant number, since it is smaller than the sum of its proper divisors (265789212).

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

138671208 is a wasteful number, since it uses less digits than its factorization.

138671208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148178 (or 148171 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 138671208 is about 11775.8739803040. The cubic root of 138671208 is about 517.6013888022.

The spelling of 138671208 in words is "one hundred thirty-eight million, six hundred seventy-one thousand, two hundred eight".