138800138 has 8 divisors (see below), whose sum is σ = 220447332. Its totient is φ = 65317696.

The previous prime is 138800107. The next prime is 138800141. The reversal of 138800138 is 831008831.

It can be written as a sum of positive squares in 2 ways, for example, as 133102369 + 5697769 = 11537^2 + 2387^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041145 + ... + 2041212.

Almost surely, 2^138800138 is an apocalyptic number.

138800138 is a deficient number, since it is larger than the sum of its proper divisors (81647194).

138800138 is a wasteful number, since it uses less digits than its factorization.

138800138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4082376.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 138800138 is about 11781.3470367357. The cubic root of 138800138 is about 517.7617529627.

Adding to 138800138 its reverse (831008831), we get a palindrome (969808969).

The spelling of 138800138 in words is "one hundred thirty-eight million, eight hundred thousand, one hundred thirty-eight".