138601387 has 4 divisors (see below), whose sum is σ = 138675096. Its totient is φ = 138527680.

The previous prime is 138601373. The next prime is 138601399. The reversal of 138601387 is 783106831.

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

It is a cyclic number.

It is not a de Polignac number, because 138601387 - 2¹¹ = 138599339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138601087) 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 3 ways as a sum of consecutive naturals, for example, 33958 + ... + 37819.

It is an arithmetic number, because the mean of its divisors is an integer number (34668774).

Almost surely, 2^138601387 is an apocalyptic number.

138601387 is a deficient number, since it is larger than the sum of its proper divisors (73709).

138601387 is an equidigital number, since it uses as much as digits as its factorization.

138601387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73708.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 138601387 is about 11772.9090287830. The cubic root of 138601387 is about 517.5145033937.

The spelling of 138601387 in words is "one hundred thirty-eight million, six hundred one thousand, three hundred eighty-seven".