247993 has 2 divisors, whose sum is σ = 247994. Its totient is φ = 247992.

The previous prime is 247991. The next prime is 247997. The reversal of 247993 is 399742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242064 + 5929 = 492^2 + 77^2 .

It is a cyclic number.

It is not a de Polignac number, because 247993 - 2¹ = 247991 is a prime.

Together with 247991, it forms a pair of twin primes.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (247991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123996 + 123997.

It is an arithmetic number, because the mean of its divisors is an integer number (123997).

2²⁴⁷⁹⁹³ is an apocalyptic number.

It is an amenable number.

247993 is a deficient number, since it is larger than the sum of its proper divisors (1).

247993 is an equidigital number, since it uses as much as digits as its factorization.

247993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 34.

The square root of 247993 is about 497.9889557008. The cubic root of 247993 is about 62.8270219223.

The spelling of 247993 in words is "two hundred forty-seven thousand, nine hundred ninety-three".