138243934 has 8 divisors (see below), whose sum is σ = 210765528. Its totient is φ = 67988760.

The previous prime is 138243913. The next prime is 138243947. The reversal of 138243934 is 439342831.

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

It is a super-2 number, since 2×138243934² = 38222770575592712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138243893 and 138243902.

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 3 ways as a sum of consecutive naturals, for example, 566452 + ... + 566695.

It is an arithmetic number, because the mean of its divisors is an integer number (26345691).

Almost surely, 2^138243934 is an apocalyptic number.

138243934 is a deficient number, since it is larger than the sum of its proper divisors (72521594).

138243934 is a wasteful number, since it uses less digits than its factorization.

138243934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133210.

The product of its digits is 62208, while the sum is 37.

The square root of 138243934 is about 11757.7180609164. The cubic root of 138243934 is about 517.0692303910.

The spelling of 138243934 in words is "one hundred thirty-eight million, two hundred forty-three thousand, nine hundred thirty-four".