243797405 has 4 divisors (see below), whose sum is σ = 292556892. Its totient is φ = 195037920.

The previous prime is 243797399. The next prime is 243797429. The reversal of 243797405 is 504797342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29789764 + 214007641 = 5458^2 + 14629^2 .

It is not a de Polignac number, because 243797405 - 2²² = 239603101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24379736 + ... + 24379745.

It is an arithmetic number, because the mean of its divisors is an integer number (73139223).

Almost surely, 2^243797405 is an apocalyptic number.

It is an amenable number.

243797405 is a deficient number, since it is larger than the sum of its proper divisors (48759487).

243797405 is an equidigital number, since it uses as much as digits as its factorization.

243797405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48759486.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 243797405 is about 15614.0130972150. The cubic root of 243797405 is about 624.7069815791.

The spelling of 243797405 in words is "two hundred forty-three million, seven hundred ninety-seven thousand, four hundred five".