243226520 has 64 divisors (see below), whose sum is σ = 563401440. Its totient is φ = 94464000.

The previous prime is 243226519. The next prime is 243226547. The reversal of 243226520 is 25622342.

It is a self number, because there is not a number n which added to its sum of digits gives 243226520.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201920 + ... + 203120.

Almost surely, 2^243226520 is an apocalyptic number.

243226520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243226520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (281700720).

243226520 is an abundant number, since it is smaller than the sum of its proper divisors (320174920).

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

243226520 is a wasteful number, since it uses less digits than its factorization.

243226520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 243226520 is about 15595.7212080750. The cubic root of 243226520 is about 624.2189881727.

Adding to 243226520 its reverse (25622342), we get a palindrome (268848862).

The spelling of 243226520 in words is "two hundred forty-three million, two hundred twenty-six thousand, five hundred twenty".