138366841 has 8 divisors (see below), whose sum is σ = 143539200. Its totient is φ = 133280160.

The previous prime is 138366829. The next prime is 138366847. The reversal of 138366841 is 148663831.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 138366841 - 2⁷ = 138366713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138366794 and 138366803.

It is not an unprimeable number, because it can be changed into a prime (138366847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18121 + ... + 24598.

It is an arithmetic number, because the mean of its divisors is an integer number (17942400).

Almost surely, 2^138366841 is an apocalyptic number.

It is an amenable number.

138366841 is a deficient number, since it is larger than the sum of its proper divisors (5172359).

138366841 is an equidigital number, since it uses as much as digits as its factorization.

138366841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42839.

The product of its digits is 82944, while the sum is 40.

The square root of 138366841 is about 11762.9435516796. The cubic root of 138366841 is about 517.2224200023. Note that the first 3 decimals are identical.

The spelling of 138366841 in words is "one hundred thirty-eight million, three hundred sixty-six thousand, eight hundred forty-one".