138680405 has 8 divisors (see below), whose sum is σ = 166499712. Its totient is φ = 110888848.

The previous prime is 138680401. The next prime is 138680413. The reversal of 138680405 is 504086831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138680405 - 2² = 138680401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138680401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6392 + ... + 17838.

It is an arithmetic number, because the mean of its divisors is an integer number (20812464).

Almost surely, 2^138680405 is an apocalyptic number.

It is an amenable number.

138680405 is a deficient number, since it is larger than the sum of its proper divisors (27819307).

138680405 is a wasteful number, since it uses less digits than its factorization.

138680405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13875.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 138680405 is about 11776.2644756306. The cubic root of 138680405 is about 517.6128313956.

The spelling of 138680405 in words is "one hundred thirty-eight million, six hundred eighty thousand, four hundred five".