138953293 has 2 divisors, whose sum is σ = 138953294. Its totient is φ = 138953292.

The previous prime is 138953279. The next prime is 138953299. The reversal of 138953293 is 392359831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106440489 + 32512804 = 10317^2 + 5702^2 .

It is an emirp because it is prime and its reverse (392359831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138953293 is a prime.

It is a super-3 number, since 3×138953293³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138953299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69476646 + 69476647.

It is an arithmetic number, because the mean of its divisors is an integer number (69476647).

Almost surely, 2^138953293 is an apocalyptic number.

It is an amenable number.

138953293 is a deficient number, since it is larger than the sum of its proper divisors (1).

138953293 is an equidigital number, since it uses as much as digits as its factorization.

138953293 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 43.

The square root of 138953293 is about 11787.8451381073. The cubic root of 138953293 is about 517.9521193749.

The spelling of 138953293 in words is "one hundred thirty-eight million, nine hundred fifty-three thousand, two hundred ninety-three".