9140821 has 4 divisors (see below), whose sum is σ = 9538272. Its totient is φ = 8743372.

The previous prime is 9140809. The next prime is 9140851. The reversal of 9140821 is 1280419.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 9140821 - 2¹⁹ = 8616533 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 (9140851) 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, 198691 + ... + 198736.

It is an arithmetic number, because the mean of its divisors is an integer number (2384568).

Almost surely, 2^9140821 is an apocalyptic number.

It is an amenable number.

9140821 is a deficient number, since it is larger than the sum of its proper divisors (397451).

9140821 is a wasteful number, since it uses less digits than its factorization.

9140821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397450.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 9140821 is about 3023.3790698488. The cubic root of 9140821 is about 209.0876596333.

The spelling of 9140821 in words is "nine million, one hundred forty thousand, eight hundred twenty-one".