9966923 has 4 divisors (see below), whose sum is σ = 10310640. Its totient is φ = 9623208.

The previous prime is 9966883. The next prime is 9966937. The reversal of 9966923 is 3296699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3296699 = 7 ⋅470957.

It is a cyclic number.

It is not a de Polignac number, because 9966923 - 2⁸ = 9966667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9966023) 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, 171815 + ... + 171872.

It is an arithmetic number, because the mean of its divisors is an integer number (2577660).

Almost surely, 2^9966923 is an apocalyptic number.

9966923 is a deficient number, since it is larger than the sum of its proper divisors (343717).

9966923 is a wasteful number, since it uses less digits than its factorization.

9966923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343716.

The product of its digits is 157464, while the sum is 44.

The square root of 9966923 is about 3157.0433953305. The cubic root of 9966923 is about 215.2056658288.

The spelling of 9966923 in words is "nine million, nine hundred sixty-six thousand, nine hundred twenty-three".