247739 has 2 divisors, whose sum is σ = 247740. Its totient is φ = 247738.

The previous prime is 247729. The next prime is 247759. The reversal of 247739 is 937742.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 247739 - 2¹² = 243643 is a prime.

It is a super-2 number, since 2×247739² = 122749224242, which contains 22 as substring.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (247729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123869 + 123870.

It is an arithmetic number, because the mean of its divisors is an integer number (123870).

2²⁴⁷⁷³⁹ is an apocalyptic number.

247739 is a deficient number, since it is larger than the sum of its proper divisors (1).

247739 is an equidigital number, since it uses as much as digits as its factorization.

247739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 32.

The square root of 247739 is about 497.7338646305. The cubic root of 247739 is about 62.8055649794.

The spelling of 247739 in words is "two hundred forty-seven thousand, seven hundred thirty-nine".