243906265 has 16 divisors (see below), whose sum is σ = 304570368. Its totient is φ = 187360576.

The previous prime is 243906241. The next prime is 243906301. The reversal of 243906265 is 562609342.

It is a cyclic number.

It is not a de Polignac number, because 243906265 - 2¹¹ = 243904217 is a prime.

It is a super-2 number, since 2×243906265² = 118980532212500450, which contains 22 as substring.

It is a Duffinian number.

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, 2664 + ... + 22246.

It is an arithmetic number, because the mean of its divisors is an integer number (19035648).

Almost surely, 2^243906265 is an apocalyptic number.

It is an amenable number.

243906265 is a deficient number, since it is larger than the sum of its proper divisors (60664103).

243906265 is a wasteful number, since it uses less digits than its factorization.

243906265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19688.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 243906265 is about 15617.4986793660. The cubic root of 243906265 is about 624.7999487740.

The spelling of 243906265 in words is "two hundred forty-three million, nine hundred six thousand, two hundred sixty-five".