243686425 has 6 divisors (see below), whose sum is σ = 302171198. Its totient is φ = 194949120.

The previous prime is 243686393. The next prime is 243686447. The reversal of 243686425 is 524686342.

It can be written as a sum of positive squares in 3 ways, for example, as 43718544 + 199967881 = 6612^2 + 14141^2 .

It is not a de Polignac number, because 243686425 - 2⁵ = 243686393 is a prime.

It is a Duffinian 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 5 ways as a sum of consecutive naturals, for example, 4873704 + ... + 4873753.

Almost surely, 2^243686425 is an apocalyptic number.

243686425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

243686425 is a deficient number, since it is larger than the sum of its proper divisors (58484773).

243686425 is an equidigital number, since it uses as much as digits as its factorization.

243686425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9747467 (or 9747462 counting only the distinct ones).

The product of its digits is 276480, while the sum is 40.

The square root of 243686425 is about 15610.4588337435. The cubic root of 243686425 is about 624.6121753971.

The spelling of 243686425 in words is "two hundred forty-three million, six hundred eighty-six thousand, four hundred twenty-five".