243200520 has 96 divisors (see below), whose sum is σ = 809728920. Its totient is φ = 63267840.

The previous prime is 243200501. The next prime is 243200527. The reversal of 243200520 is 25002342.

It can be written as a sum of positive squares in 4 ways, for example, as 110628324 + 132572196 = 10518^2 + 11514^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 243200493 and 243200502.

It is not an unprimeable number, because it can be changed into a prime (243200527) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6522 + ... + 22998.

Almost surely, 2^243200520 is an apocalyptic number.

243200520 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 243200520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404864460).

243200520 is an abundant number, since it is smaller than the sum of its proper divisors (566528400).

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

243200520 is a wasteful number, since it uses less digits than its factorization.

243200520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16535 (or 16528 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 243200520 is about 15594.8876238337. The cubic root of 243200520 is about 624.1967451596.

Adding to 243200520 its reverse (25002342), we get a palindrome (268202862).

The spelling of 243200520 in words is "two hundred forty-three million, two hundred thousand, five hundred twenty".