243658 has 8 divisors (see below), whose sum is σ = 378180. Its totient is φ = 117600.

The previous prime is 243647. The next prime is 243671. The reversal of 243658 is 856342.

It can be written as a sum of positive squares in 2 ways, for example, as 227529 + 16129 = 477^2 + 127^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2043 + ... + 2158.

2²⁴³⁶⁵⁸ is an apocalyptic number.

243658 is a deficient number, since it is larger than the sum of its proper divisors (134522).

243658 is a wasteful number, since it uses less digits than its factorization.

243658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4232.

The product of its digits is 5760, while the sum is 28.

The square root of 243658 is about 493.6172606382. The cubic root of 243658 is about 62.4587888322.

It can be divided in two parts, 2 and 43658, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 243658 in words is "two hundred forty-three thousand, six hundred fifty-eight".