138645207 has 6 divisors (see below), whose sum is σ = 200265312. Its totient is φ = 92430132.

The previous prime is 138645203. The next prime is 138645209. The reversal of 138645207 is 702546831.

138645207 is a `hidden beast` number, since 1 + 3 + 8 + 645 + 2 + 0 + 7 = 666.

138645207 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138645207 - 2² = 138645203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138645203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7702503 + ... + 7702520.

It is an arithmetic number, because the mean of its divisors is an integer number (33377552).

Almost surely, 2^138645207 is an apocalyptic number.

138645207 is a deficient number, since it is larger than the sum of its proper divisors (61620105).

138645207 is a wasteful number, since it uses less digits than its factorization.

138645207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15405029 (or 15405026 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 138645207 is about 11774.7699340582. The cubic root of 138645207 is about 517.5690365085.

The spelling of 138645207 in words is "one hundred thirty-eight million, six hundred forty-five thousand, two hundred seven".