9427921 has 2 divisors, whose sum is σ = 9427922. Its totient is φ = 9427920.

The previous prime is 9427903. The next prime is 9427931. The reversal of 9427921 is 1297249.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8346321 + 1081600 = 2889^2 + 1040^2 .

It is an emirp because it is prime and its reverse (1297249) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9427921 - 2⁵ = 9427889 is a prime.

It is not a weakly prime, because it can be changed into another prime (9427931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4713960 + 4713961.

It is an arithmetic number, because the mean of its divisors is an integer number (4713961).

Almost surely, 2^9427921 is an apocalyptic number.

It is an amenable number.

9427921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9427921 is an equidigital number, since it uses as much as digits as its factorization.

9427921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 9427921 is about 3070.4919801231. The cubic root of 9427921 is about 211.2541803265.

The spelling of 9427921 in words is "nine million, four hundred twenty-seven thousand, nine hundred twenty-one".