138217934 has 8 divisors (see below), whose sum is σ = 207391968. Its totient is φ = 69087280.

The previous prime is 138217921. The next prime is 138217949. The reversal of 138217934 is 439712831.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1142 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (25923996).

Almost surely, 2^138217934 is an apocalyptic number.

138217934 is a deficient number, since it is larger than the sum of its proper divisors (69174034).

138217934 is a wasteful number, since it uses less digits than its factorization.

138217934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21690.

The product of its digits is 36288, while the sum is 38.

The square root of 138217934 is about 11756.6123522042. The cubic root of 138217934 is about 517.0368127109.

The spelling of 138217934 in words is "one hundred thirty-eight million, two hundred seventeen thousand, nine hundred thirty-four".