138449471 has 4 divisors (see below), whose sum is σ = 138475344. Its totient is φ = 138423600.

The previous prime is 138449453. The next prime is 138449477. The reversal of 138449471 is 174944831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 174944831 = 23 ⋅7606297.

It is a cyclic number.

It is not a de Polignac number, because 138449471 - 2¹⁰ = 138448447 is a prime.

It is a super-3 number, since 3×138449471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138449477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1595 + ... + 16716.

It is an arithmetic number, because the mean of its divisors is an integer number (34618836).

Almost surely, 2^138449471 is an apocalyptic number.

138449471 is a deficient number, since it is larger than the sum of its proper divisors (25873).

138449471 is an equidigital number, since it uses as much as digits as its factorization.

138449471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25872.

The product of its digits is 96768, while the sum is 41.

The square root of 138449471 is about 11766.4553286026. The cubic root of 138449471 is about 517.3253579211.

The spelling of 138449471 in words is "one hundred thirty-eight million, four hundred forty-nine thousand, four hundred seventy-one".