9725843218 has 64 divisors (see below), whose sum is σ = 18677514240. Its totient is φ = 3694766400.

The previous prime is 9725843209. The next prime is 9725843221. The reversal of 9725843218 is 8123485279.

It is a super-2 number, since 2×9725843218² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 732523 + ... + 745681.

It is an arithmetic number, because the mean of its divisors is an integer number (291836160).

Almost surely, 2^9725843218 is an apocalyptic number.

9725843218 is a deficient number, since it is larger than the sum of its proper divisors (8951671022).

9725843218 is a wasteful number, since it uses less digits than its factorization.

9725843218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13343.

The product of its digits is 967680, while the sum is 49.

The square root of 9725843218 is about 98619.6898088815. The cubic root of 9725843218 is about 2134.5635452380.

The spelling of 9725843218 in words is "nine billion, seven hundred twenty-five million, eight hundred forty-three thousand, two hundred eighteen".