247705 has 8 divisors (see below), whose sum is σ = 300672. Its totient is φ = 195888.

The previous prime is 247697. The next prime is 247711. The reversal of 247705 is 507742.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 247705 - 2³ = 247697 is a prime.

It is a super-2 number, since 2×247705² = 122715534050, which contains 22 as substring.

It is a Duffinian number.

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 247705.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 304 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (37584).

2²⁴⁷⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

247705 is a deficient number, since it is larger than the sum of its proper divisors (52967).

247705 is a wasteful number, since it uses less digits than its factorization.

247705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575.

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 247705 is about 497.6997086597. The cubic root of 247705 is about 62.8026916774.

The spelling of 247705 in words is "two hundred forty-seven thousand, seven hundred five".