138389311 has 4 divisors (see below), whose sum is σ = 138688672. Its totient is φ = 138089952.

The previous prime is 138389267. The next prime is 138389347. The reversal of 138389311 is 113983831.

It is a happy number.

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 138389311 - 2¹³ = 138381119 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 (138489311) 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, 148986 + ... + 149911.

It is an arithmetic number, because the mean of its divisors is an integer number (34672168).

Almost surely, 2^138389311 is an apocalyptic number.

138389311 is a deficient number, since it is larger than the sum of its proper divisors (299361).

138389311 is an equidigital number, since it uses as much as digits as its factorization.

138389311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299360.

The product of its digits is 15552, while the sum is 37.

The square root of 138389311 is about 11763.8986309811. The cubic root of 138389311 is about 517.2504164949.

The spelling of 138389311 in words is "one hundred thirty-eight million, three hundred eighty-nine thousand, three hundred eleven".