247289 has 4 divisors (see below), whose sum is σ = 282624. Its totient is φ = 211956.

The previous prime is 247279. The next prime is 247301. The reversal of 247289 is 982742.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982742 = 2 ⋅491371.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247289 is a prime.

It is a super-2 number, since 2×247289² = 122303699042, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17657 + ... + 17670.

It is an arithmetic number, because the mean of its divisors is an integer number (70656).

2²⁴⁷²⁸⁹ is an apocalyptic number.

It is an amenable number.

247289 is a deficient number, since it is larger than the sum of its proper divisors (35335).

247289 is an equidigital number, since it uses as much as digits as its factorization.

247289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35334.

The product of its digits is 8064, while the sum is 32.

The square root of 247289 is about 497.2816103578. The cubic root of 247289 is about 62.7675146741.

It can be divided in two parts, 24 and 7289, that multiplied together give a triangular number (174936 = T₅₉₁).

The spelling of 247289 in words is "two hundred forty-seven thousand, two hundred eighty-nine".