138658181 has 8 divisors (see below), whose sum is σ = 146328000. Its totient is φ = 131025600.

The previous prime is 138658151. The next prime is 138658207. The reversal of 138658181 is 181856831.

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 138658181 - 2¹⁰ = 138657157 is a prime.

It is a super-2 number, since 2×138658181² = 38452182316457522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138658141) 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, 1481 + ... + 16718.

It is an arithmetic number, because the mean of its divisors is an integer number (18291000).

Almost surely, 2^138658181 is an apocalyptic number.

It is an amenable number.

138658181 is a deficient number, since it is larger than the sum of its proper divisors (7669819).

138658181 is a wasteful number, since it uses less digits than its factorization.

138658181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18619.

The product of its digits is 46080, while the sum is 41.

The square root of 138658181 is about 11775.3208448857. The cubic root of 138658181 is about 517.5851801877.

The spelling of 138658181 in words is "one hundred thirty-eight million, six hundred fifty-eight thousand, one hundred eighty-one".