138487308 has 12 divisors (see below), whose sum is σ = 323137080. Its totient is φ = 46162432.

The previous prime is 138487291. The next prime is 138487331. The reversal of 138487308 is 803784831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 138487308.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5770293 + ... + 5770316.

It is an arithmetic number, because the mean of its divisors is an integer number (26928090).

Almost surely, 2^138487308 is an apocalyptic number.

It is an amenable number.

138487308 is an abundant number, since it is smaller than the sum of its proper divisors (184649772).

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

138487308 is a wasteful number, since it uses less digits than its factorization.

138487308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11540616 (or 11540614 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 138487308 is about 11768.0630521764. The cubic root of 138487308 is about 517.3724804238.

The spelling of 138487308 in words is "one hundred thirty-eight million, four hundred eighty-seven thousand, three hundred eight".