138607493 has 2 divisors, whose sum is σ = 138607494. Its totient is φ = 138607492.

The previous prime is 138607481. The next prime is 138607507. The reversal of 138607493 is 394706831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134142724 + 4464769 = 11582^2 + 2113^2 .

It is a cyclic number.

It is not a de Polignac number, because 138607493 - 2¹⁰ = 138606469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138607493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138607423) 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 as a sum of consecutive naturals, namely, 69303746 + 69303747.

It is an arithmetic number, because the mean of its divisors is an integer number (69303747).

Almost surely, 2^138607493 is an apocalyptic number.

It is an amenable number.

138607493 is a deficient number, since it is larger than the sum of its proper divisors (1).

138607493 is an equidigital number, since it uses as much as digits as its factorization.

138607493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 138607493 is about 11773.1683501086. The cubic root of 138607493 is about 517.5221028779.

The spelling of 138607493 in words is "one hundred thirty-eight million, six hundred seven thousand, four hundred ninety-three".