243215380 has 12 divisors (see below), whose sum is σ = 510752340. Its totient is φ = 97286144.

The previous prime is 243215359. The next prime is 243215381. The reversal of 243215380 is 83512342.

It can be written as a sum of positive squares in 2 ways, for example, as 192321424 + 50893956 = 13868^2 + 7134^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243215381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6080365 + ... + 6080404.

It is an arithmetic number, because the mean of its divisors is an integer number (42562695).

Almost surely, 2^243215380 is an apocalyptic number.

243215380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243215380 is an abundant number, since it is smaller than the sum of its proper divisors (267536960).

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

243215380 is a wasteful number, since it uses less digits than its factorization.

243215380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12160778 (or 12160776 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 243215380 is about 15595.3640547440. The cubic root of 243215380 is about 624.2094580912.

The spelling of 243215380 in words is "two hundred forty-three million, two hundred fifteen thousand, three hundred eighty".