138166717 has 4 divisors (see below), whose sum is σ = 148794940. Its totient is φ = 127538496.

The previous prime is 138166673. The next prime is 138166733. The reversal of 138166717 is 717661831.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21288996 + 116877721 = 4614^2 + 10811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138166717 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138166717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138166747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5314092 + ... + 5314117.

It is an arithmetic number, because the mean of its divisors is an integer number (37198735).

Almost surely, 2^138166717 is an apocalyptic number.

It is an amenable number.

138166717 is a deficient number, since it is larger than the sum of its proper divisors (10628223).

138166717 is a wasteful number, since it uses less digits than its factorization.

138166717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10628222.

The product of its digits is 42336, while the sum is 40.

The square root of 138166717 is about 11754.4339293732. The cubic root of 138166717 is about 516.9729417278.

The spelling of 138166717 in words is "one hundred thirty-eight million, one hundred sixty-six thousand, seven hundred seventeen".