138475308 has 54 divisors (see below), whose sum is σ = 335038284. Its totient is φ = 44514288.

The previous prime is 138475303. The next prime is 138475313. The reversal of 138475308 is 803574831.

It is an interprime number because it is at equal distance from previous prime (138475303) and next prime (138475313).

It is not an unprimeable number, because it can be changed into a prime (138475303) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1752813 + ... + 1752891.

Almost surely, 2^138475308 is an apocalyptic number.

It is an amenable number.

138475308 is an abundant number, since it is smaller than the sum of its proper divisors (196562976).

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

138475308 is an equidigital number, since it uses as much as digits as its factorization.

138475308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 127 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 138475308 is about 11767.5531866230. The cubic root of 138475308 is about 517.3575364573.

The spelling of 138475308 in words is "one hundred thirty-eight million, four hundred seventy-five thousand, three hundred eight".