138686541 has 16 divisors (see below), whose sum is σ = 211655808. Its totient is φ = 79128000.

The previous prime is 138686539. The next prime is 138686551. The reversal of 138686541 is 145686831.

It is not a de Polignac number, because 138686541 - 2¹ = 138686539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138686493 and 138686502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138686551) 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, 10011 + ... + 19431.

It is an arithmetic number, because the mean of its divisors is an integer number (13228488).

Almost surely, 2^138686541 is an apocalyptic number.

It is an amenable number.

138686541 is a deficient number, since it is larger than the sum of its proper divisors (72969267).

138686541 is an equidigital number, since it uses as much as digits as its factorization.

138686541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132.

The product of its digits is 138240, while the sum is 42.

The square root of 138686541 is about 11776.5249967892. The cubic root of 138686541 is about 517.6204653159.

The spelling of 138686541 in words is "one hundred thirty-eight million, six hundred eighty-six thousand, five hundred forty-one".