243898 has 4 divisors (see below), whose sum is σ = 365850. Its totient is φ = 121948.

The previous prime is 243889. The next prime is 243911. The reversal of 243898 is 898342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 898342 = 2 ⋅449171.

It can be written as a sum of positive squares in only one way, i.e., 233289 + 10609 = 483^2 + 103^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 60973 + ... + 60976.

2²⁴³⁸⁹⁸ is an apocalyptic number.

243898 is a deficient number, since it is larger than the sum of its proper divisors (121952).

243898 is a wasteful number, since it uses less digits than its factorization.

243898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121951.

The product of its digits is 13824, while the sum is 34.

The square root of 243898 is about 493.8603041347. The cubic root of 243898 is about 62.4792891377.

It can be divided in two parts, 24389 and 8, that multiplied together give a cube (195112 = 58³).

The spelling of 243898 in words is "two hundred forty-three thousand, eight hundred ninety-eight".