247957 has 2 divisors, whose sum is σ = 247958. Its totient is φ = 247956.

The previous prime is 247943. The next prime is 247991. The reversal of 247957 is 759742.

247957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (247991) can be obtained adding 247957 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 239121 + 8836 = 489^2 + 94^2 .

It is a cyclic number.

It is not a de Polignac number, because 247957 - 2⁷ = 247829 is a prime.

It is a super-2 number, since 2×247957² = 122965347698, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (247997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123978 + 123979.

It is an arithmetic number, because the mean of its divisors is an integer number (123979).

2²⁴⁷⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

247957 is a deficient number, since it is larger than the sum of its proper divisors (1).

247957 is an equidigital number, since it uses as much as digits as its factorization.

247957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17640, while the sum is 34.

The square root of 247957 is about 497.9528090090. The cubic root of 247957 is about 62.8239816721.

The spelling of 247957 in words is "two hundred forty-seven thousand, nine hundred fifty-seven".