247143994 has 16 divisors (see below), whose sum is σ = 394801128. Its totient is φ = 115628032.

The previous prime is 247143991. The next prime is 247144021. The reversal of 247143994 is 499341742.

247143994 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 236021769 + 11122225 = 15363^2 + 3335^2 .

It is a super-2 number, since 2×247143994² = 122160307540544072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 247143994.

It is not an unprimeable number, because it can be changed into a prime (247143991) 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 7 ways as a sum of consecutive naturals, for example, 15127 + ... + 26890.

Almost surely, 2^247143994 is an apocalyptic number.

247143994 is a deficient number, since it is larger than the sum of its proper divisors (147657134).

247143994 is a wasteful number, since it uses less digits than its factorization.

247143994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42209.

The product of its digits is 217728, while the sum is 43.

The square root of 247143994 is about 15720.8140374473. The cubic root of 247143994 is about 627.5524367962.

The spelling of 247143994 in words is "two hundred forty-seven million, one hundred forty-three thousand, nine hundred ninety-four".