243847 has 4 divisors (see below), whose sum is σ = 248040. Its totient is φ = 239656.

The previous prime is 243839. The next prime is 243851. The reversal of 243847 is 748342.

243847 = 2⁴ + 3⁴ + ... + 16⁴.

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

It is a cyclic number.

It is not a de Polignac number, because 243847 - 2³ = 243839 is a prime.

It is a super-2 number, since 2×243847² = 118922718818, which contains 22 as substring.

It is a Duffinian number.

243847 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243857) 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, 2008 + ... + 2125.

It is an arithmetic number, because the mean of its divisors is an integer number (62010).

2²⁴³⁸⁴⁷ is an apocalyptic number.

243847 is a deficient number, since it is larger than the sum of its proper divisors (4193).

243847 is an equidigital number, since it uses as much as digits as its factorization.

243847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192.

The product of its digits is 5376, while the sum is 28.

The square root of 243847 is about 493.8086674006. The cubic root of 243847 is about 62.4749339484.

It can be divided in two parts, 2438 and 47, that added together give a triangular number (2485 = T₇₀).

The spelling of 243847 in words is "two hundred forty-three thousand, eight hundred forty-seven".