243240865 has 16 divisors (see below), whose sum is σ = 334015488. Its totient is φ = 166579776.

The previous prime is 243240859. The next prime is 243240883. The reversal of 243240865 is 568042342.

It is a cyclic number.

It is not a de Polignac number, because 243240865 - 2¹³ = 243232673 is a prime.

It is a super-2 number, since 2×243240865² = 118332236811896450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243240865.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26179 + ... + 34231.

It is an arithmetic number, because the mean of its divisors is an integer number (20875968).

Almost surely, 2^243240865 is an apocalyptic number.

It is an amenable number.

243240865 is a deficient number, since it is larger than the sum of its proper divisors (90774623).

243240865 is an equidigital number, since it uses as much as digits as its factorization.

243240865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8928.

The product of its (nonzero) digits is 46080, while the sum is 34.

The square root of 243240865 is about 15596.1811030778. The cubic root of 243240865 is about 624.2312596489.

The spelling of 243240865 in words is "two hundred forty-three million, two hundred forty thousand, eight hundred sixty-five".