138572393 has 2 divisors, whose sum is σ = 138572394. Its totient is φ = 138572392.

The previous prime is 138572347. The next prime is 138572407. The reversal of 138572393 is 393275831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115175824 + 23396569 = 10732^2 + 4837^2 .

It is a cyclic number.

It is not a de Polignac number, because 138572393 - 2¹⁶ = 138506857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138572393.

It is not a weakly prime, because it can be changed into another prime (138572293) 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 as a sum of consecutive naturals, namely, 69286196 + 69286197.

It is an arithmetic number, because the mean of its divisors is an integer number (69286197).

Almost surely, 2^138572393 is an apocalyptic number.

It is an amenable number.

138572393 is a deficient number, since it is larger than the sum of its proper divisors (1).

138572393 is an equidigital number, since it uses as much as digits as its factorization.

138572393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 41.

The square root of 138572393 is about 11771.6775779835. The cubic root of 138572393 is about 517.4784146208.

The spelling of 138572393 in words is "one hundred thirty-eight million, five hundred seventy-two thousand, three hundred ninety-three".