138716285 has 4 divisors (see below), whose sum is σ = 166459548. Its totient is φ = 110973024.

The previous prime is 138716273. The next prime is 138716297. The reversal of 138716285 is 582617831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 582617831 = 41 ⋅14210191.

It is an interprime number because it is at equal distance from previous prime (138716273) and next prime (138716297).

It can be written as a sum of positive squares in 2 ways, for example, as 94984516 + 43731769 = 9746^2 + 6613^2 .

It is a cyclic number.

It is not a de Polignac number, because 138716285 - 2⁴ = 138716269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13871624 + ... + 13871633.

It is an arithmetic number, because the mean of its divisors is an integer number (41614887).

Almost surely, 2^138716285 is an apocalyptic number.

It is an amenable number.

138716285 is a deficient number, since it is larger than the sum of its proper divisors (27743263).

138716285 is an equidigital number, since it uses as much as digits as its factorization.

138716285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27743262.

The product of its digits is 80640, while the sum is 41.

The square root of 138716285 is about 11777.7877803941. The cubic root of 138716285 is about 517.6574672304.

The spelling of 138716285 in words is "one hundred thirty-eight million, seven hundred sixteen thousand, two hundred eighty-five".