138432471 has 4 divisors (see below), whose sum is σ = 184576632. Its totient is φ = 92288312.

The previous prime is 138432451. The next prime is 138432487. The reversal of 138432471 is 174234831.

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 138432471 - 2⁵ = 138432439 is a prime.

It is a super-3 number, since 3×138432471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138432401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23072076 + ... + 23072081.

It is an arithmetic number, because the mean of its divisors is an integer number (46144158).

Almost surely, 2^138432471 is an apocalyptic number.

138432471 is a deficient number, since it is larger than the sum of its proper divisors (46144161).

138432471 is an equidigital number, since it uses as much as digits as its factorization.

138432471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46144160.

The product of its digits is 16128, while the sum is 33.

The square root of 138432471 is about 11765.7329138477. The cubic root of 138432471 is about 517.3041831898.

The spelling of 138432471 in words is "one hundred thirty-eight million, four hundred thirty-two thousand, four hundred seventy-one".