138989311 has 8 divisors (see below), whose sum is σ = 139838400. Its totient is φ = 138143520.

The previous prime is 138989281. The next prime is 138989317. The reversal of 138989311 is 113989831.

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-138989311 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 (138989317) 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, 167245 + ... + 168073.

It is an arithmetic number, because the mean of its divisors is an integer number (17479800).

Almost surely, 2^138989311 is an apocalyptic number.

138989311 is a deficient number, since it is larger than the sum of its proper divisors (849089).

138989311 is an equidigital number, since it uses as much as digits as its factorization.

138989311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649.

The product of its digits is 46656, while the sum is 43.

The square root of 138989311 is about 11789.3727992629. The cubic root of 138989311 is about 517.9968681951.

The spelling of 138989311 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, three hundred eleven".