243440100 has 72 divisors (see below), whose sum is σ = 782623520. Its totient is φ = 64916640.

The previous prime is 243440089. The next prime is 243440101. The reversal of 243440100 is 1044342.

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

It is not an unprimeable number, because it can be changed into a prime (243440101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42382 + ... + 47781.

Almost surely, 2^243440100 is an apocalyptic number.

243440100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243440100 is an abundant number, since it is smaller than the sum of its proper divisors (539183420).

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

243440100 is a wasteful number, since it uses less digits than its factorization.

243440100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90186 (or 90173 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243440100 is about 15602.5670964749. The cubic root of 243440100 is about 624.4016460055.

Adding to 243440100 its reverse (1044342), we get a palindrome (244484442).

The spelling of 243440100 in words is "two hundred forty-three million, four hundred forty thousand, one hundred".