138742381 has 8 divisors (see below), whose sum is σ = 142128800. Its totient is φ = 135363312.

The previous prime is 138742379. The next prime is 138742397. The reversal of 138742381 is 183247831.

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

It is not a de Polignac number, because 138742381 - 2¹ = 138742379 is a prime.

It is a super-2 number, since 2×138742381² = 38498896571098322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138742381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138742781) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 65566 + ... + 67648.

It is an arithmetic number, because the mean of its divisors is an integer number (17766100).

Almost surely, 2^138742381 is an apocalyptic number.

It is an amenable number.

138742381 is a deficient number, since it is larger than the sum of its proper divisors (3386419).

138742381 is a wasteful number, since it uses less digits than its factorization.

138742381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3675.

The product of its digits is 32256, while the sum is 37.

The square root of 138742381 is about 11778.8955764112. The cubic root of 138742381 is about 517.6899266306.

The spelling of 138742381 in words is "one hundred thirty-eight million, seven hundred forty-two thousand, three hundred eighty-one".