243989889 has 32 divisors (see below), whose sum is σ = 383854464. Its totient is φ = 135905280.

The previous prime is 243989881. The next prime is 243989891. The reversal of 243989889 is 988989342.

It is a happy number.

It is not a de Polignac number, because 243989889 - 2³ = 243989881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243989881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109147 + ... + 111359.

It is an arithmetic number, because the mean of its divisors is an integer number (11995452).

Almost surely, 2^243989889 is an apocalyptic number.

It is an amenable number.

243989889 is a deficient number, since it is larger than the sum of its proper divisors (139864575).

243989889 is a wasteful number, since it uses less digits than its factorization.

243989889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497.

The product of its digits is 8957952, while the sum is 60.

The square root of 243989889 is about 15620.1757032371. The cubic root of 243989889 is about 624.8713454653.

The spelling of 243989889 in words is "two hundred forty-three million, nine hundred eighty-nine thousand, eight hundred eighty-nine".