9920186839 has 4 divisors (see below), whose sum is σ = 9920789824. Its totient is φ = 9919583856.

The previous prime is 9920186831. The next prime is 9920186863. The reversal of 9920186839 is 9386810299.

9920186839 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9920186839 - 2³ = 9920186831 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9920186839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9920186831) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 276102 + ... + 309955.

It is an arithmetic number, because the mean of its divisors is an integer number (2480197456).

Almost surely, 2^9920186839 is an apocalyptic number.

9920186839 is a deficient number, since it is larger than the sum of its proper divisors (602985).

9920186839 is a wasteful number, since it uses less digits than its factorization.

9920186839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602984.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 9920186839 is about 99600.1347338446. The cubic root of 9920186839 is about 2148.6876316825.

The spelling of 9920186839 in words is "nine billion, nine hundred twenty million, one hundred eighty-six thousand, eight hundred thirty-nine".