138850247 has 2 divisors, whose sum is σ = 138850248. Its totient is φ = 138850246.

The previous prime is 138850211. The next prime is 138850253. The reversal of 138850247 is 742058831.

It is a strong prime.

It is an emirp because it is prime and its reverse (742058831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138850247 - 2¹⁰ = 138849223 is a prime.

It is a super-2 number, since 2×138850247² = 38558782183922018, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138850247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138850207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69425123 + 69425124.

It is an arithmetic number, because the mean of its divisors is an integer number (69425124).

Almost surely, 2^138850247 is an apocalyptic number.

138850247 is a deficient number, since it is larger than the sum of its proper divisors (1).

138850247 is an equidigital number, since it uses as much as digits as its factorization.

138850247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 138850247 is about 11783.4734692280. The cubic root of 138850247 is about 517.8240521375.

The spelling of 138850247 in words is "one hundred thirty-eight million, eight hundred fifty thousand, two hundred forty-seven".