247729 has 2 divisors, whose sum is σ = 247730. Its totient is φ = 247728.

The previous prime is 247717. The next prime is 247739. The reversal of 247729 is 927742.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245025 + 2704 = 495^2 + 52^2 .

It is a cyclic number.

It is not a de Polignac number, because 247729 - 2⁵ = 247697 is a prime.

It is a super-2 number, since 2×247729² = 122739314882, which contains 22 as substring.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 247729.

It is not a weakly prime, because it can be changed into another prime (247739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123864 + 123865.

It is an arithmetic number, because the mean of its divisors is an integer number (123865).

2²⁴⁷⁷²⁹ is an apocalyptic number.

It is an amenable number.

247729 is a deficient number, since it is larger than the sum of its proper divisors (1).

247729 is an equidigital number, since it uses as much as digits as its factorization.

247729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 31.

The square root of 247729 is about 497.7238190001. The cubic root of 247729 is about 62.8047199179.

The spelling of 247729 in words is "two hundred forty-seven thousand, seven hundred twenty-nine".