138994081 has 8 divisors (see below), whose sum is σ = 140001120. Its totient is φ = 137991168.

The previous prime is 138994061. The next prime is 138994109. The reversal of 138994081 is 180499831.

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 138994081 - 2¹¹ = 138992033 is a prime.

It is a super-2 number, since 2×138994081² = 38638709106069122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138994021) 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, 96690 + ... + 98116.

It is an arithmetic number, because the mean of its divisors is an integer number (17500140).

Almost surely, 2^138994081 is an apocalyptic number.

It is an amenable number.

138994081 is a deficient number, since it is larger than the sum of its proper divisors (1007039).

138994081 is a wasteful number, since it uses less digits than its factorization.

138994081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2063.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 138994081 is about 11789.5750983655. The cubic root of 138994081 is about 518.0027938709.

The spelling of 138994081 in words is "one hundred thirty-eight million, nine hundred ninety-four thousand, eighty-one".