243989897 has 8 divisors (see below), whose sum is σ = 246271200. Its totient is φ = 241716384.

The previous prime is 243989891. The next prime is 243989909. The reversal of 243989897 is 798989342.

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 243989897 - 2⁴ = 243989881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243989891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74429 + ... + 77637.

It is an arithmetic number, because the mean of its divisors is an integer number (30783900).

Almost surely, 2^243989897 is an apocalyptic number.

It is an amenable number.

243989897 is a deficient number, since it is larger than the sum of its proper divisors (2281303).

243989897 is a wasteful number, since it uses less digits than its factorization.

243989897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3895.

The product of its digits is 7838208, while the sum is 59.

The square root of 243989897 is about 15620.1759593162. The cubic root of 243989897 is about 624.8713522948.

The spelling of 243989897 in words is "two hundred forty-three million, nine hundred eighty-nine thousand, eight hundred ninety-seven".