138678765 has 8 divisors (see below), whose sum is σ = 221886048. Its totient is φ = 73962000.

The previous prime is 138678751. The next prime is 138678781. The reversal of 138678765 is 567876831.

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

It is not a de Polignac number, because 138678765 - 2⁸ = 138678509 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 4622611 + ... + 4622640.

It is an arithmetic number, because the mean of its divisors is an integer number (27735756).

Almost surely, 2^138678765 is an apocalyptic number.

138678765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138678765 is a deficient number, since it is larger than the sum of its proper divisors (83207283).

138678765 is an equidigital number, since it uses as much as digits as its factorization.

138678765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9245259.

The product of its digits is 1693440, while the sum is 51.

The square root of 138678765 is about 11776.1948438364. The cubic root of 138678765 is about 517.6107910006.

The spelling of 138678765 in words is "one hundred thirty-eight million, six hundred seventy-eight thousand, seven hundred sixty-five".