243404401 has 4 divisors (see below), whose sum is σ = 246832704. Its totient is φ = 239976100.

The previous prime is 243404393. The next prime is 243404431. The reversal of 243404401 is 104404342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243404401 - 2³ = 243404393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243404431) 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, 1714045 + ... + 1714186.

It is an arithmetic number, because the mean of its divisors is an integer number (61708176).

Almost surely, 2^243404401 is an apocalyptic number.

It is an amenable number.

243404401 is a deficient number, since it is larger than the sum of its proper divisors (3428303).

243404401 is an equidigital number, since it uses as much as digits as its factorization.

243404401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428302.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 243404401 is about 15601.4230440688. The cubic root of 243404401 is about 624.3711229541.

Adding to 243404401 its reverse (104404342), we get a palindrome (347808743).

The spelling of 243404401 in words is "two hundred forty-three million, four hundred four thousand, four hundred one".