243886689 has 6 divisors (see below), whose sum is σ = 352280786. Its totient is φ = 162591120.

The previous prime is 243886681. The next prime is 243886691. The reversal of 243886689 is 986688342.

It can be written as a sum of positive squares in only one way, i.e., 155376225 + 88510464 = 12465^2 + 9408^2 .

It is not a de Polignac number, because 243886689 - 2³ = 243886681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243886681) 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 5 ways as a sum of consecutive naturals, for example, 13549252 + ... + 13549269.

Almost surely, 2^243886689 is an apocalyptic number.

It is an amenable number.

243886689 is a deficient number, since it is larger than the sum of its proper divisors (108394097).

243886689 is a wasteful number, since it uses less digits than its factorization.

243886689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27098527 (or 27098524 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 243886689 is about 15616.8719339053. The cubic root of 243886689 is about 624.7832327745.

The spelling of 243886689 in words is "two hundred forty-three million, eight hundred eighty-six thousand, six hundred eighty-nine".