138582321 has 8 divisors (see below), whose sum is σ = 185090400. Its totient is φ = 92231232.

The previous prime is 138582319. The next prime is 138582373. The reversal of 138582321 is 123285831.

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

It is not a de Polignac number, because 138582321 - 2¹ = 138582319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138582391) 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, 37171 + ... + 40728.

It is an arithmetic number, because the mean of its divisors is an integer number (23136300).

Almost surely, 2^138582321 is an apocalyptic number.

It is an amenable number.

138582321 is a deficient number, since it is larger than the sum of its proper divisors (46508079).

138582321 is an equidigital number, since it uses as much as digits as its factorization.

138582321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78495.

The product of its digits is 11520, while the sum is 33.

The square root of 138582321 is about 11772.0992605397. The cubic root of 138582321 is about 517.4907725490.

The spelling of 138582321 in words is "one hundred thirty-eight million, five hundred eighty-two thousand, three hundred twenty-one".