138715447 has 16 divisors (see below), whose sum is σ = 157732960. Its totient is φ = 120932352.

The previous prime is 138715441. The next prime is 138715453. The reversal of 138715447 is 744517831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138715441) and next prime (138715453).

It is a 11-Lehmer number, since φ(138715447) divides (138715447-1)¹¹.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138715447 is a prime.

It is a Duffinian number.

138715447 is a modest number, since divided by 15447 gives 1387 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138715441) 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 15 ways as a sum of consecutive naturals, for example, 106303 + ... + 107599.

It is an arithmetic number, because the mean of its divisors is an integer number (9858310).

Almost surely, 2^138715447 is an apocalyptic number.

138715447 is a deficient number, since it is larger than the sum of its proper divisors (19017513).

138715447 is a wasteful number, since it uses less digits than its factorization.

138715447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762.

The product of its digits is 94080, while the sum is 40.

The square root of 138715447 is about 11777.7522048989. The cubic root of 138715447 is about 517.6564248202.

The spelling of 138715447 in words is "one hundred thirty-eight million, seven hundred fifteen thousand, four hundred forty-seven".