9819966 has 16 divisors (see below), whose sum is σ = 21150864. Its totient is φ = 3021504.

The previous prime is 9819961. The next prime is 9819967. The reversal of 9819966 is 6699189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9819961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62871 + ... + 63026.

It is an arithmetic number, because the mean of its divisors is an integer number (1321929).

Almost surely, 2^9819966 is an apocalyptic number.

9819966 is an abundant number, since it is smaller than the sum of its proper divisors (11330898).

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

9819966 is a wasteful number, since it uses less digits than its factorization.

9819966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125915.

The product of its digits is 209952, while the sum is 48.

The square root of 9819966 is about 3133.6824982758. The cubic root of 9819966 is about 214.1427265772.

The spelling of 9819966 in words is "nine million, eight hundred nineteen thousand, nine hundred sixty-six".