138807793 has 2 divisors, whose sum is σ = 138807794. Its totient is φ = 138807792.

The previous prime is 138807791. The next prime is 138807817. The reversal of 138807793 is 397708831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136025569 + 2782224 = 11663^2 + 1668^2 .

It is a cyclic number.

It is not a de Polignac number, because 138807793 - 2¹ = 138807791 is a prime.

Together with 138807791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (138807791) 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, 69403896 + 69403897.

It is an arithmetic number, because the mean of its divisors is an integer number (69403897).

Almost surely, 2^138807793 is an apocalyptic number.

It is an amenable number.

138807793 is a deficient number, since it is larger than the sum of its proper divisors (1).

138807793 is an equidigital number, since it uses as much as digits as its factorization.

138807793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 138807793 is about 11781.6719102172. The cubic root of 138807793 is about 517.7712711890.

The spelling of 138807793 in words is "one hundred thirty-eight million, eight hundred seven thousand, seven hundred ninety-three".