243636073 has 4 divisors (see below), whose sum is σ = 245044548. Its totient is φ = 242227600.

The previous prime is 243636049. The next prime is 243636089. The reversal of 243636073 is 370636342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 370636342 = 2 ⋅185318171.

It can be written as a sum of positive squares in 2 ways, for example, as 215884249 + 27751824 = 14693^2 + 5268^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243636073 is a prime.

It is a super-2 number, since 2×243636073² = 118717072133722658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243634073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703978 + ... + 704323.

It is an arithmetic number, because the mean of its divisors is an integer number (61261137).

Almost surely, 2^243636073 is an apocalyptic number.

It is an amenable number.

243636073 is a deficient number, since it is larger than the sum of its proper divisors (1408475).

243636073 is a wasteful number, since it uses less digits than its factorization.

243636073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408474.

The product of its (nonzero) digits is 54432, while the sum is 34.

The square root of 243636073 is about 15608.8459855301. The cubic root of 243636073 is about 624.5691520203.

The spelling of 243636073 in words is "two hundred forty-three million, six hundred thirty-six thousand, seventy-three".