247849 has 4 divisors (see below), whose sum is σ = 283264. Its totient is φ = 212436.

The previous prime is 247847. The next prime is 247853. The reversal of 247849 is 948742.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 247849 - 2¹ = 247847 is a prime.

It is a super-2 number, since 2×247849² = 122858253602, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (247847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17697 + ... + 17710.

It is an arithmetic number, because the mean of its divisors is an integer number (70816).

2²⁴⁷⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

247849 is a deficient number, since it is larger than the sum of its proper divisors (35415).

247849 is an equidigital number, since it uses as much as digits as its factorization.

247849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35414.

The product of its digits is 16128, while the sum is 34.

The square root of 247849 is about 497.8443531868. The cubic root of 247849 is about 62.8148591558.

The spelling of 247849 in words is "two hundred forty-seven thousand, eight hundred forty-nine".