9809938420 has 48 divisors (see below), whose sum is σ = 20774190528. Its totient is φ = 3891104000.

The previous prime is 9809938409. The next prime is 9809938423. The reversal of 9809938420 is 248399089.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9809938423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1165467 + ... + 1173853.

It is an arithmetic number, because the mean of its divisors is an integer number (432795636).

Almost surely, 2^9809938420 is an apocalyptic number.

It is an amenable number.

9809938420 is an abundant number, since it is smaller than the sum of its proper divisors (10964252108).

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

9809938420 is a wasteful number, since it uses less digits than its factorization.

9809938420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880 (or 8878 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 52.

The square root of 9809938420 is about 99045.1332474241. The cubic root of 9809938420 is about 2140.6981170671.

The spelling of 9809938420 in words is "nine billion, eight hundred nine million, nine hundred thirty-eight thousand, four hundred twenty".