138875306 has 4 divisors (see below), whose sum is σ = 208312962. Its totient is φ = 69437652.

The previous prime is 138875293. The next prime is 138875339. The reversal of 138875306 is 603578831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 99700225 + 39175081 = 9985^2 + 6259^2 .

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 as a sum of consecutive naturals, namely, 34718825 + ... + 34718828.

Almost surely, 2^138875306 is an apocalyptic number.

138875306 is a deficient number, since it is larger than the sum of its proper divisors (69437656).

138875306 is an equidigital number, since it uses as much as digits as its factorization.

138875306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69437655.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 138875306 is about 11784.5367325152. The cubic root of 138875306 is about 517.8552016977.

The spelling of 138875306 in words is "one hundred thirty-eight million, eight hundred seventy-five thousand, three hundred six".