138727201 has 4 divisors (see below), whose sum is σ = 143202304. Its totient is φ = 134252100.

The previous prime is 138727187. The next prime is 138727207. The reversal of 138727201 is 102727831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138727201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 4475071 = 138727201 / (1 + 3 + 8 + 7 + 2 + 7 + 2 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138727207) by changing a digit.

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, 2237505 + ... + 2237566.

It is an arithmetic number, because the mean of its divisors is an integer number (35800576).

Almost surely, 2^138727201 is an apocalyptic number.

It is an amenable number.

138727201 is a deficient number, since it is larger than the sum of its proper divisors (4475103).

138727201 is an equidigital number, since it uses as much as digits as its factorization.

138727201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475102.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 138727201 is about 11778.2511859783. The cubic root of 138727201 is about 517.6710455465.

The spelling of 138727201 in words is "one hundred thirty-eight million, seven hundred twenty-seven thousand, two hundred one".