247897 has 4 divisors (see below), whose sum is σ = 266980. Its totient is φ = 228816.

The previous prime is 247889. The next prime is 247901. The reversal of 247897 is 798742.

It is a happy number.

247897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163216 + 84681 = 404^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 247897 - 2³ = 247889 is a prime.

It is a super-2 number, since 2×247897² = 122905845218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (247847) 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, 9522 + ... + 9547.

It is an arithmetic number, because the mean of its divisors is an integer number (66745).

2²⁴⁷⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

247897 is a deficient number, since it is larger than the sum of its proper divisors (19083).

247897 is a wasteful number, since it uses less digits than its factorization.

247897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19082.

The product of its digits is 28224, while the sum is 37.

The square root of 247897 is about 497.8925586911. The cubic root of 247897 is about 62.8189139346.

It can be divided in two parts, 24 and 7897, that added together give a square (7921 = 89²).

The spelling of 247897 in words is "two hundred forty-seven thousand, eight hundred ninety-seven".