138750247 has 2 divisors, whose sum is σ = 138750248. Its totient is φ = 138750246.

The previous prime is 138750229. The next prime is 138750257. The reversal of 138750247 is 742057831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138750247 is a prime.

It is a super-2 number, since 2×138750247² = 38503262085122018, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138750257) 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, 69375123 + 69375124.

It is an arithmetic number, because the mean of its divisors is an integer number (69375124).

Almost surely, 2^138750247 is an apocalyptic number.

138750247 is a deficient number, since it is larger than the sum of its proper divisors (1).

138750247 is an equidigital number, since it uses as much as digits as its factorization.

138750247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 138750247 is about 11779.2294739512. The cubic root of 138750247 is about 517.6997099234.

The spelling of 138750247 in words is "one hundred thirty-eight million, seven hundred fifty thousand, two hundred forty-seven".