138447767 has 8 divisors (see below), whose sum is σ = 144228480. Its totient is φ = 132749280.

The previous prime is 138447763. The next prime is 138447773. The reversal of 138447767 is 767744831.

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

It is a cyclic number.

It is not a de Polignac number, because 138447767 - 2² = 138447763 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 (138447763) 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, 17108 + ... + 23865.

It is an arithmetic number, because the mean of its divisors is an integer number (18028560).

Almost surely, 2^138447767 is an apocalyptic number.

138447767 is a deficient number, since it is larger than the sum of its proper divisors (5780713).

138447767 is a wasteful number, since it uses less digits than its factorization.

138447767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41113.

The product of its digits is 790272, while the sum is 47.

The square root of 138447767 is about 11766.3829191472. The cubic root of 138447767 is about 517.3232355439.

The spelling of 138447767 in words is "one hundred thirty-eight million, four hundred forty-seven thousand, seven hundred sixty-seven".