138703793 has 2 divisors, whose sum is σ = 138703794. Its totient is φ = 138703792.

The previous prime is 138703783. The next prime is 138703837. The reversal of 138703793 is 397307831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81126049 + 57577744 = 9007^2 + 7588^2 .

It is a cyclic number.

It is not a de Polignac number, because 138703793 - 2¹⁰ = 138702769 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138703793.

It is not a weakly prime, because it can be changed into another prime (138703753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69351896 + 69351897.

It is an arithmetic number, because the mean of its divisors is an integer number (69351897).

Almost surely, 2^138703793 is an apocalyptic number.

It is an amenable number.

138703793 is a deficient number, since it is larger than the sum of its proper divisors (1).

138703793 is an equidigital number, since it uses as much as digits as its factorization.

138703793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 138703793 is about 11777.2574481498. The cubic root of 138703793 is about 517.6419276678.

The spelling of 138703793 in words is "one hundred thirty-eight million, seven hundred three thousand, seven hundred ninety-three".