243457 has 4 divisors (see below), whose sum is σ = 257796. Its totient is φ = 229120.

The previous prime is 243437. The next prime is 243461. The reversal of 243457 is 754342.

243457 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, and also an emirpimes, since its reverse is a distinct semiprime: 754342 = 2 ⋅377171.

It can be written as a sum of positive squares in 2 ways, for example, as 76176 + 167281 = 276^2 + 409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243437) 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, 7144 + ... + 7177.

It is an arithmetic number, because the mean of its divisors is an integer number (64449).

2²⁴³⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

243457 is a deficient number, since it is larger than the sum of its proper divisors (14339).

243457 is a wasteful number, since it uses less digits than its factorization.

243457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14338.

The product of its digits is 3360, while the sum is 25.

The square root of 243457 is about 493.4136195931. The cubic root of 243457 is about 62.4416094657.

Adding to 243457 its reverse (754342), we get a palindrome (997799).

It can be divided in two parts, 24 and 3457, that added together give a square (3481 = 59²).

The spelling of 243457 in words is "two hundred forty-three thousand, four hundred fifty-seven".