138908448 has 72 divisors (see below), whose sum is σ = 451459008. Its totient is φ = 39687552.

The previous prime is 138908417. The next prime is 138908467. The reversal of 138908448 is 844809831.

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32436 + ... + 36467.

It is an arithmetic number, because the mean of its divisors is an integer number (6270264).

Almost surely, 2^138908448 is an apocalyptic number.

138908448 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138908448 is an abundant number, since it is smaller than the sum of its proper divisors (312550560).

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

138908448 is a wasteful number, since it uses less digits than its factorization.

138908448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68926 (or 68915 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 138908448 is about 11785.9428133688. The cubic root of 138908448 is about 517.8963930669.

The spelling of 138908448 in words is "one hundred thirty-eight million, nine hundred eight thousand, four hundred forty-eight".