138724671 has 4 divisors (see below), whose sum is σ = 184966232. Its totient is φ = 92483112.

The previous prime is 138724667. The next prime is 138724673. The reversal of 138724671 is 176427831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138724671 - 2² = 138724667 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138724673) 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, 23120776 + ... + 23120781.

It is an arithmetic number, because the mean of its divisors is an integer number (46241558).

Almost surely, 2^138724671 is an apocalyptic number.

138724671 is a deficient number, since it is larger than the sum of its proper divisors (46241561).

138724671 is an equidigital number, since it uses as much as digits as its factorization.

138724671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46241560.

The product of its digits is 56448, while the sum is 39.

The square root of 138724671 is about 11778.1437841453. The cubic root of 138724671 is about 517.6678985652.

The spelling of 138724671 in words is "one hundred thirty-eight million, seven hundred twenty-four thousand, six hundred seventy-one".