247842813 has 16 divisors (see below), whose sum is σ = 350386560. Its totient is φ = 155291136.

The previous prime is 247842809. The next prime is 247842851. The reversal of 247842813 is 318248742.

It is not a de Polignac number, because 247842813 - 2² = 247842809 is a prime.

It is a super-2 number, since 2×247842813² = 122852119911505938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247842853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38256 + ... + 44262.

It is an arithmetic number, because the mean of its divisors is an integer number (21899160).

Almost surely, 2^247842813 is an apocalyptic number.

It is an amenable number.

247842813 is a deficient number, since it is larger than the sum of its proper divisors (102543747).

247842813 is a wasteful number, since it uses less digits than its factorization.

247842813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6836.

The product of its digits is 86016, while the sum is 39.

The square root of 247842813 is about 15743.0242647339. The cubic root of 247842813 is about 628.1433647362.

The spelling of 247842813 in words is "two hundred forty-seven million, eight hundred forty-two thousand, eight hundred thirteen".