138471849 has 12 divisors (see below), whose sum is σ = 207423216. Its totient is φ = 92314404.

The previous prime is 138471833. The next prime is 138471869. The reversal of 138471849 is 948174831.

It is a happy number.

138471849 is a `hidden beast` number, since 138 + 471 + 8 + 49 = 666.

It is not a de Polignac number, because 138471849 - 2⁴ = 138471833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138471869) 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 11 ways as a sum of consecutive naturals, for example, 284679 + ... + 285164.

It is an arithmetic number, because the mean of its divisors is an integer number (17285268).

Almost surely, 2^138471849 is an apocalyptic number.

It is an amenable number.

138471849 is a deficient number, since it is larger than the sum of its proper divisors (68951367).

138471849 is an frugal number, since it uses more digits than its factorization.

138471849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569858 (or 569846 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 138471849 is about 11767.4062137754. The cubic root of 138471849 is about 517.3532286986.

The spelling of 138471849 in words is "one hundred thirty-eight million, four hundred seventy-one thousand, eight hundred forty-nine".