243155240 has 16 divisors (see below), whose sum is σ = 547099380. Its totient is φ = 97262080.

The previous prime is 243155221. The next prime is 243155251. The reversal of 243155240 is 42551342.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 205234276 + 37920964 = 14326^2 + 6158^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3039401 + ... + 3039480.

Almost surely, 2^243155240 is an apocalyptic number.

243155240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243155240 is an abundant number, since it is smaller than the sum of its proper divisors (303944140).

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

243155240 is a wasteful number, since it uses less digits than its factorization.

243155240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078892 (or 6078888 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 243155240 is about 15593.4357984378. The cubic root of 243155240 is about 624.1580043119.

The spelling of 243155240 in words is "two hundred forty-three million, one hundred fifty-five thousand, two hundred forty".