243897 has 4 divisors (see below), whose sum is σ = 325200. Its totient is φ = 162596.

The previous prime is 243889. The next prime is 243911. The reversal of 243897 is 798342.

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.

It is a cyclic number.

It is not a de Polignac number, because 243897 - 2³ = 243889 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (243857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40647 + ... + 40652.

It is an arithmetic number, because the mean of its divisors is an integer number (81300).

2²⁴³⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

243897 is a deficient number, since it is larger than the sum of its proper divisors (81303).

243897 is an equidigital number, since it uses as much as digits as its factorization.

243897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81302.

The product of its digits is 12096, while the sum is 33.

The square root of 243897 is about 493.8592917016. The cubic root of 243897 is about 62.4792037477.

It can be divided in two parts, 24 and 3897, that multiplied together give a triangular number (93528 = T₄₃₂).

The spelling of 243897 in words is "two hundred forty-three thousand, eight hundred ninety-seven".