247424 has 16 divisors (see below), whose sum is σ = 493170. Its totient is φ = 123648.

The previous prime is 247421. The next prime is 247433. The reversal of 247424 is 424742.

It can be written as a sum of positive squares in only one way, i.e., 193600 + 53824 = 440^2 + 232^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×247424² = 122437271552, which contains 22 as substring.

It is an Ulam number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 247424.

It is not an unprimeable number, because it can be changed into a prime (247421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839 + ... + 1094.

2²⁴⁷⁴²⁴ is an apocalyptic number.

It is an amenable number.

247424 is a deficient number, since it is larger than the sum of its proper divisors (245746).

247424 is an equidigital number, since it uses as much as digits as its factorization.

247424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1935 counting only the distinct ones).

The product of its digits is 1792, while the sum is 23.

The square root of 247424 is about 497.4173298147. The cubic root of 247424 is about 62.7789346091.

The spelling of 247424 in words is "two hundred forty-seven thousand, four hundred twenty-four", and thus it is an iban number.