138408039 has 96 divisors (see below), whose sum is σ = 264176640. Its totient is φ = 67737600.

The previous prime is 138407993. The next prime is 138408047. The reversal of 138408039 is 930804831.

It is not a de Polignac number, because 138408039 - 2¹¹ = 138405991 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138407994 and 138408012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138408139) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1426839 + ... + 1426935.

It is an arithmetic number, because the mean of its divisors is an integer number (2751840).

Almost surely, 2^138408039 is an apocalyptic number.

138408039 is a deficient number, since it is larger than the sum of its proper divisors (125768601).

138408039 is a wasteful number, since it uses less digits than its factorization.

138408039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 218 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 138408039 is about 11764.6945986711. The cubic root of 138408039 is about 517.2737483279.

The spelling of 138408039 in words is "one hundred thirty-eight million, four hundred eight thousand, thirty-nine".