138705669 has 16 divisors (see below), whose sum is σ = 217578240. Its totient is φ = 87030720.

The previous prime is 138705649. The next prime is 138705673. The reversal of 138705669 is 966507831.

It is a happy number.

138705669 is a `hidden beast` number, since 1 + 3 + 87 + 0 + 566 + 9 = 666.

It is not a de Polignac number, because 138705669 - 2¹³ = 138697477 is a prime.

It is a super-2 number, since 2×138705669² = 38478525225475122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138705649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150637 + ... + 151554.

It is an arithmetic number, because the mean of its divisors is an integer number (13598640).

Almost surely, 2^138705669 is an apocalyptic number.

It is an amenable number.

138705669 is a deficient number, since it is larger than the sum of its proper divisors (78872571).

138705669 is a wasteful number, since it uses less digits than its factorization.

138705669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302217 (or 302211 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 138705669 is about 11777.3370929086. The cubic root of 138705669 is about 517.6442613984.

The spelling of 138705669 in words is "one hundred thirty-eight million, seven hundred five thousand, six hundred sixty-nine".