138750893 has 2 divisors, whose sum is σ = 138750894. Its totient is φ = 138750892.

The previous prime is 138750869. The next prime is 138750907. The reversal of 138750893 is 398057831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121594729 + 17156164 = 11027^2 + 4142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138750893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138750803) 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, 69375446 + 69375447.

It is an arithmetic number, because the mean of its divisors is an integer number (69375447).

Almost surely, 2^138750893 is an apocalyptic number.

It is an amenable number.

138750893 is a deficient number, since it is larger than the sum of its proper divisors (1).

138750893 is an equidigital number, since it uses as much as digits as its factorization.

138750893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 138750893 is about 11779.2568950677. The cubic root of 138750893 is about 517.7005133658.

The spelling of 138750893 in words is "one hundred thirty-eight million, seven hundred fifty thousand, eight hundred ninety-three".