138311686 has 4 divisors (see below), whose sum is σ = 207467532. Its totient is φ = 69155842.

The previous prime is 138311683. The next prime is 138311687. The reversal of 138311686 is 686113831.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138311683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34577920 + ... + 34577923.

It is an arithmetic number, because the mean of its divisors is an integer number (51866883).

Almost surely, 2^138311686 is an apocalyptic number.

138311686 is a deficient number, since it is larger than the sum of its proper divisors (69155846).

138311686 is an equidigital number, since it uses as much as digits as its factorization.

138311686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69155845.

The product of its digits is 20736, while the sum is 37.

The square root of 138311686 is about 11760.5988793088. The cubic root of 138311686 is about 517.1536867864.

The spelling of 138311686 in words is "one hundred thirty-eight million, three hundred eleven thousand, six hundred eighty-six".