138387873 has 8 divisors (see below), whose sum is σ = 198710848. Its totient is φ = 85161744.

The previous prime is 138387869. The next prime is 138387883. The reversal of 138387873 is 378783831.

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

It is not a de Polignac number, because 138387873 - 2² = 138387869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138387853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1774165 + ... + 1774242.

It is an arithmetic number, because the mean of its divisors is an integer number (24838856).

Almost surely, 2^138387873 is an apocalyptic number.

138387873 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

138387873 is a deficient number, since it is larger than the sum of its proper divisors (60322975).

138387873 is a wasteful number, since it uses less digits than its factorization.

138387873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3548423.

The product of its digits is 677376, while the sum is 48.

The square root of 138387873 is about 11763.8375116286. The cubic root of 138387873 is about 517.2486249098.

The spelling of 138387873 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, eight hundred seventy-three".