138181983 has 8 divisors (see below), whose sum is σ = 184527408. Its totient is φ = 91978944.

The previous prime is 138181963. The next prime is 138181987. The reversal of 138181983 is 389181831.

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

It is not a de Polignac number, because 138181983 - 2⁵ = 138181951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138181987) 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, 33310 + ... + 37227.

It is an arithmetic number, because the mean of its divisors is an integer number (23065926).

Almost surely, 2^138181983 is an apocalyptic number.

138181983 is a deficient number, since it is larger than the sum of its proper divisors (46345425).

138181983 is an equidigital number, since it uses as much as digits as its factorization.

138181983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71193.

The product of its digits is 41472, while the sum is 42.

The square root of 138181983 is about 11755.0832834140. The cubic root of 138181983 is about 516.9919810895.

The spelling of 138181983 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, nine hundred eighty-three".