138005481 has 8 divisors (see below), whose sum is σ = 187479360. Its totient is φ = 90267632.

The previous prime is 138005479. The next prime is 138005501. The reversal of 138005481 is 184500831.

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 138005481 - 2¹ = 138005479 is a prime.

It is a super-2 number, since 2×138005481² = 38091025572082722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138005381) 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, 433821 + ... + 434138.

It is an arithmetic number, because the mean of its divisors is an integer number (23434920).

Almost surely, 2^138005481 is an apocalyptic number.

It is an amenable number.

138005481 is a deficient number, since it is larger than the sum of its proper divisors (49473879).

138005481 is an equidigital number, since it uses as much as digits as its factorization.

138005481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868015.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 138005481 is about 11747.5734090066. The cubic root of 138005481 is about 516.7717666640.

The spelling of 138005481 in words is "one hundred thirty-eight million, five thousand, four hundred eighty-one".