138386438 has 16 divisors (see below), whose sum is σ = 213505584. Its totient is φ = 67223520.

The previous prime is 138386431. The next prime is 138386459. The reversal of 138386438 is 834683831.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138386431) 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, 85856 + ... + 87452.

It is an arithmetic number, because the mean of its divisors is an integer number (13344099).

Almost surely, 2^138386438 is an apocalyptic number.

138386438 is a deficient number, since it is larger than the sum of its proper divisors (75119146).

138386438 is a wasteful number, since it uses less digits than its factorization.

138386438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807.

The product of its digits is 331776, while the sum is 44.

The square root of 138386438 is about 11763.7765194686. The cubic root of 138386438 is about 517.2468370500.

The spelling of 138386438 in words is "one hundred thirty-eight million, three hundred eighty-six thousand, four hundred thirty-eight".