9966919 has 4 divisors (see below), whose sum is σ = 9975240. Its totient is φ = 9958600.

The previous prime is 9966883. The next prime is 9966937. The reversal of 9966919 is 9196699.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 9966919 - 2⁷ = 9966791 is a prime.

It is a super-2 number, since 2×9966919² = 198678948705122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9966989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984 + ... + 4885.

It is an arithmetic number, because the mean of its divisors is an integer number (2493810).

Almost surely, 2^9966919 is an apocalyptic number.

9966919 is a deficient number, since it is larger than the sum of its proper divisors (8321).

9966919 is a wasteful number, since it uses less digits than its factorization.

9966919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320.

The product of its digits is 236196, while the sum is 49.

The square root of 9966919 is about 3157.0427618263. The cubic root of 9966919 is about 215.2056370395.

The spelling of 9966919 in words is "nine million, nine hundred sixty-six thousand, nine hundred nineteen".