243917645 has 8 divisors (see below), whose sum is σ = 305427456. Its totient is φ = 186649936.

The previous prime is 243917603. The next prime is 243917657. The reversal of 243917645 is 546719342.

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 243917645 - 2¹⁶ = 243852109 is a prime.

It is a super-3 number, since 3×243917645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1060397 + ... + 1060626.

It is an arithmetic number, because the mean of its divisors is an integer number (38178432).

Almost surely, 2^243917645 is an apocalyptic number.

It is an amenable number.

243917645 is a deficient number, since it is larger than the sum of its proper divisors (61509811).

243917645 is a wasteful number, since it uses less digits than its factorization.

243917645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121051.

The product of its digits is 181440, while the sum is 41.

The square root of 243917645 is about 15617.8630100280. The cubic root of 243917645 is about 624.8096657758.

The spelling of 243917645 in words is "two hundred forty-three million, nine hundred seventeen thousand, six hundred forty-five".