247986 has 24 divisors (see below), whose sum is σ = 561600. Its totient is φ = 78936.

The previous prime is 247957. The next prime is 247991. The reversal of 247986 is 689742.

247986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×247986² = 122994112392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 247986.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 247986.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115 + ... + 713.

It is an arithmetic number, because the mean of its divisors is an integer number (23400).

2²⁴⁷⁹⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (280800).

247986 is an abundant number, since it is smaller than the sum of its proper divisors (313614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247986 is a wasteful number, since it uses less digits than its factorization.

247986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 247986 is about 497.9819273829. The cubic root of 247986 is about 62.8264307856.

The spelling of 247986 in words is "two hundred forty-seven thousand, nine hundred eighty-six".