9407921 has 4 divisors (see below), whose sum is σ = 9414144. Its totient is φ = 9401700.

The previous prime is 9407903. The next prime is 9407929. The reversal of 9407921 is 1297049.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 9407921 - 2¹⁰ = 9406897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9407929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (2353536).

Almost surely, 2^9407921 is an apocalyptic number.

It is an amenable number.

9407921 is a deficient number, since it is larger than the sum of its proper divisors (6223).

9407921 is a wasteful number, since it uses less digits than its factorization.

9407921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6222.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 9407921 is about 3067.2334440013. The cubic root of 9407921 is about 211.1046926232.

The spelling of 9407921 in words is "nine million, four hundred seven thousand, nine hundred twenty-one".