138043508 has 12 divisors (see below), whose sum is σ = 241763172. Its totient is φ = 68968320.

The previous prime is 138043483. The next prime is 138043561. The reversal of 138043508 is 805340831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33431524 + 104611984 = 5782^2 + 10228^2 .

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 3 ways as a sum of consecutive naturals, for example, 7235 + ... + 18122.

It is an arithmetic number, because the mean of its divisors is an integer number (20146931).

Almost surely, 2^138043508 is an apocalyptic number.

It is an amenable number.

138043508 is a deficient number, since it is larger than the sum of its proper divisors (103719664).

138043508 is a wasteful number, since it uses less digits than its factorization.

138043508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26722 (or 26720 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 138043508 is about 11749.1918019922. The cubic root of 138043508 is about 516.8192272797.

The spelling of 138043508 in words is "one hundred thirty-eight million, forty-three thousand, five hundred eight".