138840313 has 4 divisors (see below), whose sum is σ = 143627940. Its totient is φ = 134052688.

The previous prime is 138840301. The next prime is 138840329. The reversal of 138840313 is 313048831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313048831 = 563 ⋅556037.

It can be written as a sum of positive squares in 2 ways, for example, as 48818169 + 90022144 = 6987^2 + 9488^2 .

It is a cyclic number.

It is not a de Polignac number, because 138840313 - 2²¹ = 136743161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138840113) 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, 2393770 + ... + 2393827.

It is an arithmetic number, because the mean of its divisors is an integer number (35906985).

Almost surely, 2^138840313 is an apocalyptic number.

It is an amenable number.

138840313 is a deficient number, since it is larger than the sum of its proper divisors (4787627).

138840313 is an equidigital number, since it uses as much as digits as its factorization.

138840313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787626.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 138840313 is about 11783.0519391200. The cubic root of 138840313 is about 517.8117026533.

The spelling of 138840313 in words is "one hundred thirty-eight million, eight hundred forty thousand, three hundred thirteen".