9807421 has 4 divisors (see below), whose sum is σ = 10561852. Its totient is φ = 9052992.

The previous prime is 9807389. The next prime is 9807431. The reversal of 9807421 is 1247089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5827396 + 3980025 = 2414^2 + 1995^2 .

It is not a de Polignac number, because 9807421 - 2⁵ = 9807389 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 (9807431) 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, 377196 + ... + 377221.

It is an arithmetic number, because the mean of its divisors is an integer number (2640463).

Almost surely, 2^9807421 is an apocalyptic number.

It is an amenable number.

9807421 is a deficient number, since it is larger than the sum of its proper divisors (754431).

9807421 is a wasteful number, since it uses less digits than its factorization.

9807421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754430.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 9807421 is about 3131.6802199458. The cubic root of 9807421 is about 214.0514986550.

The spelling of 9807421 in words is "nine million, eight hundred seven thousand, four hundred twenty-one".