243551440 has 40 divisors (see below), whose sum is σ = 617737248. Its totient is φ = 88563840.

The previous prime is 243551423. The next prime is 243551459. The reversal of 243551440 is 44155342.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 243551399 and 243551408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137502 + ... + 139261.

Almost surely, 2^243551440 is an apocalyptic number.

243551440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243551440 is an abundant number, since it is smaller than the sum of its proper divisors (374185808).

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

243551440 is a wasteful number, since it uses less digits than its factorization.

243551440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276787 (or 276781 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 243551440 is about 15606.1346912040. The cubic root of 243551440 is about 624.4968238107.

The spelling of 243551440 in words is "two hundred forty-three million, five hundred fifty-one thousand, four hundred forty".