138873311 has 4 divisors (see below), whose sum is σ = 139100472. Its totient is φ = 138646152.

The previous prime is 138873307. The next prime is 138873331. The reversal of 138873311 is 113378831.

138873311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138873311 - 2² = 138873307 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 (138873331) 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, 112661 + ... + 113886.

It is an arithmetic number, because the mean of its divisors is an integer number (34775118).

Almost surely, 2^138873311 is an apocalyptic number.

138873311 is a deficient number, since it is larger than the sum of its proper divisors (227161).

138873311 is an equidigital number, since it uses as much as digits as its factorization.

138873311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227160.

The product of its digits is 12096, while the sum is 35.

The square root of 138873311 is about 11784.4520873904. The cubic root of 138873311 is about 517.8527219526.

The spelling of 138873311 in words is "one hundred thirty-eight million, eight hundred seventy-three thousand, three hundred eleven".