138917645 has 16 divisors (see below), whose sum is σ = 177191040. Its totient is φ = 104255424.

The previous prime is 138917641. The next prime is 138917651. The reversal of 138917645 is 546719831.

138917645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138917645 - 2² = 138917641 is a prime.

It is a super-3 number, since 3×138917645³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 138917596 and 138917605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138917641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2687 + ... + 16883.

It is an arithmetic number, because the mean of its divisors is an integer number (11074440).

Almost surely, 2^138917645 is an apocalyptic number.

It is an amenable number.

138917645 is a deficient number, since it is larger than the sum of its proper divisors (38273395).

138917645 is a wasteful number, since it uses less digits than its factorization.

138917645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14324.

The product of its digits is 181440, while the sum is 44.

The square root of 138917645 is about 11786.3329751030. The cubic root of 138917645 is about 517.9078226286.

The spelling of 138917645 in words is "one hundred thirty-eight million, nine hundred seventeen thousand, six hundred forty-five".