243540023 has 4 divisors (see below), whose sum is σ = 247667880. Its totient is φ = 239412168.

The previous prime is 243540019. The next prime is 243540049. The reversal of 243540023 is 320045342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 243540023 - 2² = 243540019 is a prime.

It is a super-3 number, since 3×243540023³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063840 + ... + 2063957.

It is an arithmetic number, because the mean of its divisors is an integer number (61916970).

Almost surely, 2^243540023 is an apocalyptic number.

243540023 is a deficient number, since it is larger than the sum of its proper divisors (4127857).

243540023 is an equidigital number, since it uses as much as digits as its factorization.

243540023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4127856.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 243540023 is about 15605.7689012749. The cubic root of 243540023 is about 624.4870654455.

Adding to 243540023 its reverse (320045342), we get a palindrome (563585365).

The spelling of 243540023 in words is "two hundred forty-three million, five hundred forty thousand, twenty-three".