138927393 has 40 divisors (see below), whose sum is σ = 231983136. Its totient is φ = 82123200.

The previous prime is 138927391. The next prime is 138927401. The reversal of 138927393 is 393729831.

It is not a de Polignac number, because 138927393 - 2¹ = 138927391 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138927391) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 34630 + ... + 38432.

Almost surely, 2^138927393 is an apocalyptic number.

It is an amenable number.

138927393 is a deficient number, since it is larger than the sum of its proper divisors (93055743).

138927393 is a wasteful number, since it uses less digits than its factorization.

138927393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3867 (or 3858 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 138927393 is about 11786.7464976557. The cubic root of 138927393 is about 517.9199363942.

It can be divided in two parts, 1389 and 27393, that added together give a palindrome (28782).

The spelling of 138927393 in words is "one hundred thirty-eight million, nine hundred twenty-seven thousand, three hundred ninety-three".