138210635 has 4 divisors (see below), whose sum is σ = 165852768. Its totient is φ = 110568504.

The previous prime is 138210601. The next prime is 138210637. The reversal of 138210635 is 536012831.

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 138210635 - 2¹² = 138206539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138210598 and 138210607.

It is not an unprimeable number, because it can be changed into a prime (138210637) 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, 13821059 + ... + 13821068.

It is an arithmetic number, because the mean of its divisors is an integer number (41463192).

Almost surely, 2^138210635 is an apocalyptic number.

138210635 is a deficient number, since it is larger than the sum of its proper divisors (27642133).

138210635 is an equidigital number, since it uses as much as digits as its factorization.

138210635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27642132.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 138210635 is about 11756.3019270517. The cubic root of 138210635 is about 517.0277113398.

The spelling of 138210635 in words is "one hundred thirty-eight million, two hundred ten thousand, six hundred thirty-five".