247740239 has 2 divisors, whose sum is σ = 247740240. Its totient is φ = 247740238.

The previous prime is 247740223. The next prime is 247740247. The reversal of 247740239 is 932047742.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 247740239 - 2⁴ = 247740223 is a prime.

It is a super-2 number, since 2×247740239² = 122750452039554242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247740209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123870119 + 123870120.

It is an arithmetic number, because the mean of its divisors is an integer number (123870120).

Almost surely, 2^247740239 is an apocalyptic number.

247740239 is a deficient number, since it is larger than the sum of its proper divisors (1).

247740239 is an equidigital number, since it uses as much as digits as its factorization.

247740239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 38.

The square root of 247740239 is about 15739.7661672593. The cubic root of 247740239 is about 628.0566968096.

The spelling of 247740239 in words is "two hundred forty-seven million, seven hundred forty thousand, two hundred thirty-nine".