243426 has 16 divisors (see below), whose sum is σ = 504000. Its totient is φ = 78288.

The previous prime is 243421. The next prime is 243431. The reversal of 243426 is 624342.

It is an interprime number because it is at equal distance from previous prime (243421) and next prime (243431).

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

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, 526 + ... + 873.

It is an arithmetic number, because the mean of its divisors is an integer number (31500).

2²⁴³⁴²⁶ is an apocalyptic number.

243426 is an abundant number, since it is smaller than the sum of its proper divisors (260574).

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

243426 is a wasteful number, since it uses less digits than its factorization.

243426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433.

The product of its digits is 1152, while the sum is 21.

The square root of 243426 is about 493.3822047865. The cubic root of 243426 is about 62.4389590702.

Adding to 243426 its reverse (624342), we get a palindrome (867768).

The spelling of 243426 in words is "two hundred forty-three thousand, four hundred twenty-six".