138211423 has 8 divisors (see below), whose sum is σ = 163051520. Its totient is φ = 114645240.

The previous prime is 138211399. The next prime is 138211427. The reversal of 138211423 is 324112831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138211423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138211427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318243 + ... + 318676.

It is an arithmetic number, because the mean of its divisors is an integer number (20381440).

Almost surely, 2^138211423 is an apocalyptic number.

138211423 is a deficient number, since it is larger than the sum of its proper divisors (24840097).

138211423 is an equidigital number, since it uses as much as digits as its factorization.

138211423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636957.

The product of its digits is 1152, while the sum is 25.

The square root of 138211423 is about 11756.3354409442. The cubic root of 138211423 is about 517.0286939392.

The spelling of 138211423 in words is "one hundred thirty-eight million, two hundred eleven thousand, four hundred twenty-three".