243252540 has 36 divisors (see below), whose sum is σ = 737866584. Its totient is φ = 64867296.

The previous prime is 243252533. The next prime is 243252553. The reversal of 243252540 is 45252342.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 675522 + ... + 675881.

It is an arithmetic number, because the mean of its divisors is an integer number (20496294).

Almost surely, 2^243252540 is an apocalyptic number.

243252540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243252540 is an abundant number, since it is smaller than the sum of its proper divisors (494614044).

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

243252540 is a wasteful number, since it uses less digits than its factorization.

243252540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351418 (or 1351413 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 243252540 is about 15596.5553889312. Note that the first 3 decimals coincide. The cubic root of 243252540 is about 624.2412467089.

The spelling of 243252540 in words is "two hundred forty-three million, two hundred fifty-two thousand, five hundred forty".