247047893 has 18 divisors (see below), whose sum is σ = 269508546. Its totient is φ = 226332288.

The previous prime is 247047887. The next prime is 247047901. The reversal of 247047893 is 398740742.

It can be written as a sum of positive squares in 3 ways, for example, as 127757809 + 119290084 = 11303^2 + 10922^2 .

It is not a de Polignac number, because 247047893 - 2⁴ = 247047877 is a prime.

It is a super-2 number, since 2×247047893² = 122065322871478898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247037893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1945196 + ... + 1945322.

It is an arithmetic number, because the mean of its divisors is an integer number (14972697).

Almost surely, 2^247047893 is an apocalyptic number.

It is an amenable number.

247047893 is a deficient number, since it is larger than the sum of its proper divisors (22460653).

247047893 is an equidigital number, since it uses as much as digits as its factorization.

247047893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 44.

The square root of 247047893 is about 15717.7572509566. The cubic root of 247047893 is about 627.4710857933.

The spelling of 247047893 in words is "two hundred forty-seven million, forty-seven thousand, eight hundred ninety-three".