138675686 has 16 divisors (see below), whose sum is σ = 210466080. Its totient is φ = 68523840.

The previous prime is 138675659. The next prime is 138675689. The reversal of 138675686 is 686576831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138675689) 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, 133991 + ... + 135021.

It is an arithmetic number, because the mean of its divisors is an integer number (13154130).

Almost surely, 2^138675686 is an apocalyptic number.

138675686 is a deficient number, since it is larger than the sum of its proper divisors (71790394).

138675686 is a wasteful number, since it uses less digits than its factorization.

138675686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759.

The product of its digits is 1451520, while the sum is 50.

The square root of 138675686 is about 11776.0641132766. The cubic root of 138675686 is about 517.6069602401.

The spelling of 138675686 in words is "one hundred thirty-eight million, six hundred seventy-five thousand, six hundred eighty-six".