9931421 has 8 divisors (see below), whose sum is σ = 10123200. Its totient is φ = 9741600.

The previous prime is 9931399. The next prime is 9931447. The reversal of 9931421 is 1241399.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9931421 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 (9931121) 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 7 ways as a sum of consecutive naturals, for example, 13070 + ... + 13808.

It is an arithmetic number, because the mean of its divisors is an integer number (1265400).

Almost surely, 2^9931421 is an apocalyptic number.

It is an amenable number.

9931421 is a deficient number, since it is larger than the sum of its proper divisors (191779).

9931421 is a wasteful number, since it uses less digits than its factorization.

9931421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979.

The product of its digits is 1944, while the sum is 29.

The square root of 9931421 is about 3151.4157136119. The cubic root of 9931421 is about 214.9498422746.

The spelling of 9931421 in words is "nine million, nine hundred thirty-one thousand, four hundred twenty-one".