243378 has 16 divisors (see below), whose sum is σ = 540960. Its totient is φ = 81108.

The previous prime is 243367. The next prime is 243391. The reversal of 243378 is 873342.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

243378 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 7 ways as a sum of consecutive naturals, for example, 2200 + ... + 2307.

It is an arithmetic number, because the mean of its divisors is an integer number (33810).

2²⁴³³⁷⁸ is an apocalyptic number.

243378 is an abundant number, since it is smaller than the sum of its proper divisors (297582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243378 is a wasteful number, since it uses less digits than its factorization.

243378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4518 (or 4512 counting only the distinct ones).

The product of its digits is 4032, while the sum is 27.

The square root of 243378 is about 493.3335585585. Note that the first 3 decimals coincide. The cubic root of 243378 is about 62.4348547879.

The spelling of 243378 in words is "two hundred forty-three thousand, three hundred seventy-eight".