9921967 has 4 divisors (see below), whose sum is σ = 10823976. Its totient is φ = 9019960.

The previous prime is 9921917. The next prime is 9921983. The reversal of 9921967 is 7691299.

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-9921967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9921907) 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, 450988 + ... + 451009.

It is an arithmetic number, because the mean of its divisors is an integer number (2705994).

Almost surely, 2^9921967 is an apocalyptic number.

9921967 is a deficient number, since it is larger than the sum of its proper divisors (902009).

9921967 is a wasteful number, since it uses less digits than its factorization.

9921967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 902008.

The product of its digits is 61236, while the sum is 43.

The square root of 9921967 is about 3149.9153956892. The cubic root of 9921967 is about 214.8816150134.

The spelling of 9921967 in words is "nine million, nine hundred twenty-one thousand, nine hundred sixty-seven".