138142243 has 8 divisors (see below), whose sum is σ = 142838640. Its totient is φ = 133509120.

The previous prime is 138142241. The next prime is 138142253. The reversal of 138142243 is 342241831.

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

It is not a de Polignac number, because 138142243 - 2¹ = 138142241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138142241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11358 + ... + 20131.

It is an arithmetic number, because the mean of its divisors is an integer number (17854830).

Almost surely, 2^138142243 is an apocalyptic number.

138142243 is a deficient number, since it is larger than the sum of its proper divisors (4696397).

138142243 is a wasteful number, since it uses less digits than its factorization.

138142243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31637.

The product of its digits is 4608, while the sum is 28.

The square root of 138142243 is about 11753.3928293068. The cubic root of 138142243 is about 516.9424154593.

The spelling of 138142243 in words is "one hundred thirty-eight million, one hundred forty-two thousand, two hundred forty-three".