138783247 has 2 divisors, whose sum is σ = 138783248. Its totient is φ = 138783246.

The previous prime is 138783157. The next prime is 138783251. The reversal of 138783247 is 742387831.

It is a strong prime.

It is an emirp because it is prime and its reverse (742387831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138783247 - 2⁷ = 138783119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138753247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69391623 + 69391624.

It is an arithmetic number, because the mean of its divisors is an integer number (69391624).

Almost surely, 2^138783247 is an apocalyptic number.

138783247 is a deficient number, since it is larger than the sum of its proper divisors (1).

138783247 is an equidigital number, since it uses as much as digits as its factorization.

138783247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 138783247 is about 11780.6301614133. The cubic root of 138783247 is about 517.7407494568.

The spelling of 138783247 in words is "one hundred thirty-eight million, seven hundred eighty-three thousand, two hundred forty-seven".