243813623 has 4 divisors (see below), whose sum is σ = 243994128. Its totient is φ = 243633120.

The previous prime is 243813599. The next prime is 243813629. The reversal of 243813623 is 326318342.

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 243813623 - 2¹⁸ = 243551479 is a prime.

It is a super-2 number, since 2×243813623² = 118890165520772258, 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 243813623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243813629) 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, 88211 + ... + 90932.

It is an arithmetic number, because the mean of its divisors is an integer number (60998532).

Almost surely, 2^243813623 is an apocalyptic number.

243813623 is a deficient number, since it is larger than the sum of its proper divisors (180505).

243813623 is a wasteful number, since it uses less digits than its factorization.

243813623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180504.

The product of its digits is 20736, while the sum is 32.

The square root of 243813623 is about 15614.5324297591. The cubic root of 243813623 is about 624.7208336177.

It can be divided in two parts, 2438 and 13623, that added together give a palindrome (16061).

The spelling of 243813623 in words is "two hundred forty-three million, eight hundred thirteen thousand, six hundred twenty-three".