138238867 has 4 divisors (see below), whose sum is σ = 148872640. Its totient is φ = 127605096.

The previous prime is 138238843. The next prime is 138238873. The reversal of 138238867 is 768832831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 768832831 = 13 ⋅59140987.

It is a cyclic number.

It is not a de Polignac number, because 138238867 - 2⁷ = 138238739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138238817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5316867 + ... + 5316892.

It is an arithmetic number, because the mean of its divisors is an integer number (37218160).

Almost surely, 2^138238867 is an apocalyptic number.

138238867 is a deficient number, since it is larger than the sum of its proper divisors (10633773).

138238867 is a wasteful number, since it uses less digits than its factorization.

138238867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10633772.

The product of its digits is 387072, while the sum is 46.

The square root of 138238867 is about 11757.5025834571. The cubic root of 138238867 is about 517.0629130028.

The spelling of 138238867 in words is "one hundred thirty-eight million, two hundred thirty-eight thousand, eight hundred sixty-seven".