9990819 has 24 divisors (see below), whose sum is σ = 15116400. Its totient is φ = 6350400.

The previous prime is 9990817. The next prime is 9990821. The reversal of 9990819 is 9180999.

It is an interprime number because it is at equal distance from previous prime (9990817) and next prime (9990821).

It is not a de Polignac number, because 9990819 - 2¹ = 9990817 is a prime.

It is a super-2 number, since 2×9990819² = 199632928581522, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (9990811) 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 23 ways as a sum of consecutive naturals, for example, 26172 + ... + 26550.

It is an arithmetic number, because the mean of its divisors is an integer number (629850).

Almost surely, 2^9990819 is an apocalyptic number.

9990819 is a deficient number, since it is larger than the sum of its proper divisors (5125581).

9990819 is a wasteful number, since it uses less digits than its factorization.

9990819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 9990819 is about 3160.8256832670. The cubic root of 9990819 is about 215.3775159323.

The spelling of 9990819 in words is "nine million, nine hundred ninety thousand, eight hundred nineteen".