138171826 has 8 divisors (see below), whose sum is σ = 223200684. Its totient is φ = 63771600.

The previous prime is 138171821. The next prime is 138171829. The reversal of 138171826 is 628171831.

138171826 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 136072225 + 2099601 = 11665^2 + 1449^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×138171826³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (138171821) 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, 2657125 + ... + 2657176.

Almost surely, 2^138171826 is an apocalyptic number.

138171826 is a deficient number, since it is larger than the sum of its proper divisors (85028858).

138171826 is a wasteful number, since it uses less digits than its factorization.

138171826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314316.

The product of its digits is 16128, while the sum is 37.

The square root of 138171826 is about 11754.6512496118. The cubic root of 138171826 is about 516.9793136970.

The spelling of 138171826 in words is "one hundred thirty-eight million, one hundred seventy-one thousand, eight hundred twenty-six".