138740648 has 16 divisors (see below), whose sum is σ = 260272980. Its totient is φ = 69334528.

The previous prime is 138740647. The next prime is 138740671. The reversal of 138740648 is 846047831.

It can be written as a sum of positive squares in 2 ways, for example, as 128640964 + 10099684 = 11342^2 + 3178^2 .

It is a super-3 number, since 3×138740648³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138740647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19640 + ... + 25752.

Almost surely, 2^138740648 is an apocalyptic number.

It is an amenable number.

138740648 is a deficient number, since it is larger than the sum of its proper divisors (121532332).

138740648 is a wasteful number, since it uses less digits than its factorization.

138740648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8956 (or 8952 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 138740648 is about 11778.8220124085. The cubic root of 138740648 is about 517.6877711720.

The spelling of 138740648 in words is "one hundred thirty-eight million, seven hundred forty thousand, six hundred forty-eight".