9818721436 has 24 divisors (see below), whose sum is σ = 17966438784. Its totient is φ = 4686324720.

The previous prime is 9818721401. The next prime is 9818721461. The reversal of 9818721436 is 6341278189.

9818721436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 9818721436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63510 + ... + 153853.

It is an arithmetic number, because the mean of its divisors is an integer number (748601616).

Almost surely, 2^9818721436 is an apocalyptic number.

It is an amenable number.

9818721436 is a deficient number, since it is larger than the sum of its proper divisors (8147717348).

9818721436 is a wasteful number, since it uses less digits than its factorization.

9818721436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217881 (or 217879 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 9818721436 is about 99089.4617807565. The cubic root of 9818721436 is about 2141.3367951302.

The spelling of 9818721436 in words is "nine billion, eight hundred eighteen million, seven hundred twenty-one thousand, four hundred thirty-six".