138642711 has 8 divisors (see below), whose sum is σ = 185134320. Its totient is φ = 92289792.

The previous prime is 138642697. The next prime is 138642727. The reversal of 138642711 is 117246831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138642711 - 2⁷ = 138642583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138642731) 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 7 ways as a sum of consecutive naturals, for example, 32316 + ... + 36353.

It is an arithmetic number, because the mean of its divisors is an integer number (23141790).

Almost surely, 2^138642711 is an apocalyptic number.

138642711 is a deficient number, since it is larger than the sum of its proper divisors (46491609).

138642711 is an equidigital number, since it uses as much as digits as its factorization.

138642711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69345.

The product of its digits is 8064, while the sum is 33.

The square root of 138642711 is about 11774.6639442491. The cubic root of 138642711 is about 517.5659305950.

The spelling of 138642711 in words is "one hundred thirty-eight million, six hundred forty-two thousand, seven hundred eleven".