138787838 has 16 divisors (see below), whose sum is σ = 239522400. Its totient is φ = 59080416.

The previous prime is 138787811. The next prime is 138787849. The reversal of 138787838 is 838787831.

It is a self number, because there is not a number n which added to its sum of digits gives 138787838.

It is a congruent number.

It is an unprimeable number.

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, 31181 + ... + 35352.

It is an arithmetic number, because the mean of its divisors is an integer number (14970150).

Almost surely, 2^138787838 is an apocalyptic number.

138787838 is a deficient number, since it is larger than the sum of its proper divisors (100734562).

138787838 is a wasteful number, since it uses less digits than its factorization.

138787838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66691.

The product of its digits is 1806336, while the sum is 53.

The square root of 138787838 is about 11780.8250135549. The cubic root of 138787838 is about 517.7464584110.

The spelling of 138787838 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, eight hundred thirty-eight".