243853897 has 8 divisors (see below), whose sum is σ = 279248256. Its totient is φ = 208599072.

The previous prime is 243853891. The next prime is 243853919. The reversal of 243853897 is 798358342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243853897 - 2⁷ = 243853769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 243853897.

It is not an unprimeable number, because it can be changed into a prime (243853891) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31108 + ... + 38149.

It is an arithmetic number, because the mean of its divisors is an integer number (34906032).

Almost surely, 2^243853897 is an apocalyptic number.

It is an amenable number.

243853897 is a deficient number, since it is larger than the sum of its proper divisors (35394359).

243853897 is an equidigital number, since it uses as much as digits as its factorization.

243853897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69767.

The product of its digits is 1451520, while the sum is 49.

The square root of 243853897 is about 15615.8220084631. The cubic root of 243853897 is about 624.7552295924.

It can be divided in two parts, 24385 and 3897, that added together give a palindrome (28282).

The spelling of 243853897 in words is "two hundred forty-three million, eight hundred fifty-three thousand, eight hundred ninety-seven".