138378851 has 8 divisors (see below), whose sum is σ = 149119824. Its totient is φ = 127651680.

The previous prime is 138378841. The next prime is 138378869. The reversal of 138378851 is 158873831.

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

It is not a de Polignac number, because 138378851 - 2¹⁸ = 138116707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138378811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28160 + ... + 32706.

It is an arithmetic number, because the mean of its divisors is an integer number (18639978).

Almost surely, 2^138378851 is an apocalyptic number.

138378851 is a deficient number, since it is larger than the sum of its proper divisors (10740973).

138378851 is a wasteful number, since it uses less digits than its factorization.

138378851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901.

The product of its digits is 161280, while the sum is 44.

The square root of 138378851 is about 11763.4540420745. The cubic root of 138378851 is about 517.2373842368.

The spelling of 138378851 in words is "one hundred thirty-eight million, three hundred seventy-eight thousand, eight hundred fifty-one".