247717989 has 12 divisors (see below), whose sum is σ = 359422336. Its totient is φ = 164403432.

The previous prime is 247717963. The next prime is 247718017. The reversal of 247717989 is 989717742.

247717989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247717989 - 2¹³ = 247709797 is a prime.

It is a super-2 number, since 2×247717989² = 122728404148408242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247717189) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59707 + ... + 63720.

Almost surely, 2^247717989 is an apocalyptic number.

It is an amenable number.

247717989 is a deficient number, since it is larger than the sum of its proper divisors (111704347).

247717989 is a wasteful number, since it uses less digits than its factorization.

247717989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123656 (or 123653 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 54.

The square root of 247717989 is about 15739.0593429214. The cubic root of 247717989 is about 628.0378939431.

The spelling of 247717989 in words is "two hundred forty-seven million, seven hundred seventeen thousand, nine hundred eighty-nine".