243420 has 24 divisors (see below), whose sum is σ = 681744. Its totient is φ = 64896.

The previous prime is 243403. The next prime is 243421. The reversal of 243420 is 24342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 243420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1969 + ... + 2088.

It is an arithmetic number, because the mean of its divisors is an integer number (28406).

2²⁴³⁴²⁰ is an apocalyptic number.

243420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243420 is an abundant number, since it is smaller than the sum of its proper divisors (438324).

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

243420 is a wasteful number, since it uses less digits than its factorization.

243420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4069 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 243420 is about 493.3761242703. The cubic root of 243420 is about 62.4384460644.

Adding to 243420 its reverse (24342), we get a palindrome (267762).

The spelling of 243420 in words is "two hundred forty-three thousand, four hundred twenty", and thus it is an iban number.