138614381 has 4 divisors (see below), whose sum is σ = 138654012. Its totient is φ = 138574752.

The previous prime is 138614369. The next prime is 138614383. The reversal of 138614381 is 183416831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85192900 + 53421481 = 9230^2 + 7309^2 .

It is a cyclic number.

It is not a de Polignac number, because 138614381 - 2¹⁰ = 138613357 is a prime.

It is a super-2 number, since 2×138614381² = 38427893240026322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138614383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14000 + ... + 21753.

It is an arithmetic number, because the mean of its divisors is an integer number (34663503).

Almost surely, 2^138614381 is an apocalyptic number.

It is an amenable number.

138614381 is a deficient number, since it is larger than the sum of its proper divisors (39631).

138614381 is an equidigital number, since it uses as much as digits as its factorization.

138614381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39630.

The product of its digits is 13824, while the sum is 35.

The square root of 138614381 is about 11773.4608760551. The cubic root of 138614381 is about 517.5306753659.

The spelling of 138614381 in words is "one hundred thirty-eight million, six hundred fourteen thousand, three hundred eighty-one".