1239138247 has 2 divisors, whose sum is σ = 1239138248. Its totient is φ = 1239138246.

The previous prime is 1239138233. The next prime is 1239138259. The reversal of 1239138247 is 7428319321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1239138247 - 2²⁷ = 1104920519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1239138287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619569123 + 619569124.

It is an arithmetic number, because the mean of its divisors is an integer number (619569124).

Almost surely, 2^1239138247 is an apocalyptic number.

1239138247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239138247 is an equidigital number, since it uses as much as digits as its factorization.

1239138247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 1239138247 is about 35201.3955263140. The cubic root of 1239138247 is about 1074.0881387994.

The spelling of 1239138247 in words is "one billion, two hundred thirty-nine million, one hundred thirty-eight thousand, two hundred forty-seven".