247985 has 4 divisors (see below), whose sum is σ = 297588. Its totient is φ = 198384.

The previous prime is 247957. The next prime is 247991. The reversal of 247985 is 589742.

It is a happy number.

247985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43681 + 204304 = 209^2 + 452^2 .

It is a cyclic number.

It is not a de Polignac number, because 247985 - 2⁸ = 247729 is a prime.

It is a super-2 number, since 2×247985² = 122993120450, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24794 + ... + 24803.

It is an arithmetic number, because the mean of its divisors is an integer number (74397).

2²⁴⁷⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

247985 is a deficient number, since it is larger than the sum of its proper divisors (49603).

247985 is an equidigital number, since it uses as much as digits as its factorization.

247985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49602.

The product of its digits is 20160, while the sum is 35.

The square root of 247985 is about 497.9809233294. The cubic root of 247985 is about 62.8263463365.

The spelling of 247985 in words is "two hundred forty-seven thousand, nine hundred eighty-five".