243420354405 has 24 divisors (see below), whose sum is σ = 422141971680. Its totient is φ = 129758540640.

The previous prime is 243420354379. The next prime is 243420354413. The reversal of 243420354405 is 504453024342.

243420354405 is a `hidden beast` number, since 2 + 4 + 3 + 4 + 203 + 5 + 440 + 5 = 666.

It is not a de Polignac number, because 243420354405 - 2¹⁵ = 243420321637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243420354405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1277631 + ... + 1455740.

It is an arithmetic number, because the mean of its divisors is an integer number (17589248820).

Almost surely, 2^243420354405 is an apocalyptic number.

It is an amenable number.

243420354405 is a deficient number, since it is larger than the sum of its proper divisors (178721617275).

243420354405 is a wasteful number, since it uses less digits than its factorization.

243420354405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735361 (or 2735358 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 36.

Adding to 243420354405 its reverse (504453024342), we get a palindrome (747873378747).

The spelling of 243420354405 in words is "two hundred forty-three billion, four hundred twenty million, three hundred fifty-four thousand, four hundred five".