138428311 has 8 divisors (see below), whose sum is σ = 158391200. Its totient is φ = 118512288.

The previous prime is 138428249. The next prime is 138428317. The reversal of 138428311 is 113824831.

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

It is a cyclic number.

It is not a de Polignac number, because 138428311 - 2⁹ = 138427799 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 (138428317) 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 7 ways as a sum of consecutive naturals, for example, 5136 + ... + 17413.

It is an arithmetic number, because the mean of its divisors is an integer number (19798900).

Almost surely, 2^138428311 is an apocalyptic number.

138428311 is a deficient number, since it is larger than the sum of its proper divisors (19962889).

138428311 is an equidigital number, since it uses as much as digits as its factorization.

138428311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23433.

The product of its digits is 4608, while the sum is 31.

The square root of 138428311 is about 11765.5561279525. The cubic root of 138428311 is about 517.2990013445.

The spelling of 138428311 in words is "one hundred thirty-eight million, four hundred twenty-eight thousand, three hundred eleven".