243505473 has 16 divisors (see below), whose sum is σ = 338924736. Its totient is φ = 155355840.

The previous prime is 243505447. The next prime is 243505477. The reversal of 243505473 is 374505342.

It is not a de Polignac number, because 243505473 - 2¹⁴ = 243489089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243505477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11211 + ... + 24752.

It is an arithmetic number, because the mean of its divisors is an integer number (21182796).

Almost surely, 2^243505473 is an apocalyptic number.

It is an amenable number.

243505473 is a deficient number, since it is larger than the sum of its proper divisors (95419263).

243505473 is a wasteful number, since it uses less digits than its factorization.

243505473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36064.

The product of its (nonzero) digits is 50400, while the sum is 33.

The square root of 243505473 is about 15604.6618995735. The cubic root of 243505473 is about 624.4575329301.

The spelling of 243505473 in words is "two hundred forty-three million, five hundred five thousand, four hundred seventy-three".