243445 has 8 divisors (see below), whose sum is σ = 294840. Its totient is φ = 192960.

The previous prime is 243437. The next prime is 243461. The reversal of 243445 is 544342.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18769 + 224676 = 137^2 + 474^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 243445 - 2³ = 243437 is a prime.

243445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771 + ... + 1039.

It is an arithmetic number, because the mean of its divisors is an integer number (36855).

2²⁴³⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

243445 is a deficient number, since it is larger than the sum of its proper divisors (51395).

243445 is a wasteful number, since it uses less digits than its factorization.

243445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its digits is 1920, while the sum is 22.

The square root of 243445 is about 493.4014592601. The cubic root of 243445 is about 62.4405835328.

Adding to 243445 its reverse (544342), we get a palindrome (787787).

The spelling of 243445 in words is "two hundred forty-three thousand, four hundred forty-five".