138637753 has 4 divisors (see below), whose sum is σ = 139248720. Its totient is φ = 138026788.

The previous prime is 138637739. The next prime is 138637783. The reversal of 138637753 is 357736831.

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 not a de Polignac number, because 138637753 - 2²¹ = 136540601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138637783) 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, 305143 + ... + 305596.

It is an arithmetic number, because the mean of its divisors is an integer number (34812180).

Almost surely, 2^138637753 is an apocalyptic number.

It is an amenable number.

138637753 is a deficient number, since it is larger than the sum of its proper divisors (610967).

138637753 is an equidigital number, since it uses as much as digits as its factorization.

138637753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610966.

The product of its digits is 317520, while the sum is 43.

The square root of 138637753 is about 11774.4534055726. The cubic root of 138637753 is about 517.5597609655.

The spelling of 138637753 in words is "one hundred thirty-eight million, six hundred thirty-seven thousand, seven hundred fifty-three".