243915220 has 12 divisors (see below), whose sum is σ = 512222004. Its totient is φ = 97566080.

The previous prime is 243915197. The next prime is 243915233. The reversal of 243915220 is 22519342.

It can be written as a sum of positive squares in 2 ways, for example, as 178596496 + 65318724 = 13364^2 + 8082^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6097861 + ... + 6097900.

It is an arithmetic number, because the mean of its divisors is an integer number (42685167).

Almost surely, 2^243915220 is an apocalyptic number.

243915220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243915220 is an abundant number, since it is smaller than the sum of its proper divisors (268306784).

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

243915220 is a wasteful number, since it uses less digits than its factorization.

243915220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12195770 (or 12195768 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 243915220 is about 15617.7853743737. The cubic root of 243915220 is about 624.8075951747.

The spelling of 243915220 in words is "two hundred forty-three million, nine hundred fifteen thousand, two hundred twenty".