9729186420 has 24 divisors (see below), whose sum is σ = 27241722144. Its totient is φ = 2594449696.

The previous prime is 9729186373. The next prime is 9729186431. The reversal of 9729186420 is 246819279.

It is a super-2 number, since 2×9729186420² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9729186420.

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, 81076494 + ... + 81076613.

It is an arithmetic number, because the mean of its divisors is an integer number (1135071756).

Almost surely, 2^9729186420 is an apocalyptic number.

It is an amenable number.

9729186420 is an abundant number, since it is smaller than the sum of its proper divisors (17512535724).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9729186420 is a wasteful number, since it uses less digits than its factorization.

9729186420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162153119 (or 162153117 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 9729186420 is about 98636.6383247118. The cubic root of 9729186420 is about 2134.8080984839.

The spelling of 9729186420 in words is "nine billion, seven hundred twenty-nine million, one hundred eighty-six thousand, four hundred twenty".