138539186 has 8 divisors (see below), whose sum is σ = 214512384. Its totient is φ = 67035060.

The previous prime is 138539179. The next prime is 138539209. The reversal of 138539186 is 681935831.

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

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, 1117190 + ... + 1117313.

It is an arithmetic number, because the mean of its divisors is an integer number (26814048).

Almost surely, 2^138539186 is an apocalyptic number.

138539186 is a deficient number, since it is larger than the sum of its proper divisors (75973198).

138539186 is a wasteful number, since it uses less digits than its factorization.

138539186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234536.

The product of its digits is 155520, while the sum is 44.

The square root of 138539186 is about 11770.2670318052. The cubic root of 138539186 is about 517.4370757506.

The spelling of 138539186 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, one hundred eighty-six".