9980819 has 4 divisors (see below), whose sum is σ = 10567944. Its totient is φ = 9393696.

The previous prime is 9980813. The next prime is 9980837. The reversal of 9980819 is 9180899.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9980819 is a prime.

It is a super-2 number, since 2×9980819² = 199233495821522, which contains 22 as substring.

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 9980819.

It is not an unprimeable number, because it can be changed into a prime (9980813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 293537 + ... + 293570.

It is an arithmetic number, because the mean of its divisors is an integer number (2641986).

Almost surely, 2^9980819 is an apocalyptic number.

9980819 is a deficient number, since it is larger than the sum of its proper divisors (587125).

9980819 is a wasteful number, since it uses less digits than its factorization.

9980819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587124.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 9980819 is about 3159.2434220870. The cubic root of 9980819 is about 215.3056334655.

The spelling of 9980819 in words is "nine million, nine hundred eighty thousand, eight hundred nineteen".