243949965 has 64 divisors (see below), whose sum is σ = 463491072. Its totient is φ = 107251200.

The previous prime is 243949963. The next prime is 243949967. The reversal of 243949965 is 569949342.

It is an interprime number because it is at equal distance from previous prime (243949963) and next prime (243949967).

It is not a de Polignac number, because 243949965 - 2¹ = 243949963 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243949961) 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 63 ways as a sum of consecutive naturals, for example, 320185 + ... + 320945.

It is an arithmetic number, because the mean of its divisors is an integer number (7242048).

Almost surely, 2^243949965 is an apocalyptic number.

It is an amenable number.

243949965 is a deficient number, since it is larger than the sum of its proper divisors (219541107).

243949965 is a wasteful number, since it uses less digits than its factorization.

243949965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890.

The product of its digits is 2099520, while the sum is 51.

The square root of 243949965 is about 15618.8976883774. The cubic root of 243949965 is about 624.8372610960.

The spelling of 243949965 in words is "two hundred forty-three million, nine hundred forty-nine thousand, nine hundred sixty-five".