138657704 has 8 divisors (see below), whose sum is σ = 259983210. Its totient is φ = 69328848.

The previous prime is 138657691. The next prime is 138657721. The reversal of 138657704 is 407756831.

138657704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 123432100 + 15225604 = 11110^2 + 3902^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8666099 + ... + 8666114.

Almost surely, 2^138657704 is an apocalyptic number.

It is an amenable number.

138657704 is a deficient number, since it is larger than the sum of its proper divisors (121325506).

138657704 is a wasteful number, since it uses less digits than its factorization.

138657704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17332219 (or 17332215 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 138657704 is about 11775.3005906431. The cubic root of 138657704 is about 517.5845866697.

The spelling of 138657704 in words is "one hundred thirty-eight million, six hundred fifty-seven thousand, seven hundred four".