243523420 has 24 divisors (see below), whose sum is σ = 584456544. Its totient is φ = 83493696.

The previous prime is 243523417. The next prime is 243523433. The reversal of 243523420 is 24325342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869587 + ... + 869866.

It is an arithmetic number, because the mean of its divisors is an integer number (24352356).

Almost surely, 2^243523420 is an apocalyptic number.

243523420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243523420 is an abundant number, since it is smaller than the sum of its proper divisors (340933124).

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

243523420 is a wasteful number, since it uses less digits than its factorization.

243523420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739469 (or 1739467 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 25.

The square root of 243523420 is about 15605.2369414886. The cubic root of 243523420 is about 624.4728739460.

Adding to 243523420 its reverse (24325342), we get a palindrome (267848762).

It can be divided in two parts, 24352 and 3420, that added together give a palindrome (27772).

The spelling of 243523420 in words is "two hundred forty-three million, five hundred twenty-three thousand, four hundred twenty".