139458247 has 2 divisors, whose sum is σ = 139458248. Its totient is φ = 139458246.

The previous prime is 139458167. The next prime is 139458281. The reversal of 139458247 is 742854931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 139458247 - 2¹⁹ = 138933959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139458047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69729123 + 69729124.

It is an arithmetic number, because the mean of its divisors is an integer number (69729124).

Almost surely, 2^139458247 is an apocalyptic number.

139458247 is a deficient number, since it is larger than the sum of its proper divisors (1).

139458247 is an equidigital number, since it uses as much as digits as its factorization.

139458247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 43.

The square root of 139458247 is about 11809.2441333051. The cubic root of 139458247 is about 518.5787707573.

The spelling of 139458247 in words is "one hundred thirty-nine million, four hundred fifty-eight thousand, two hundred forty-seven".