9372821 has 4 divisors (see below), whose sum is σ = 9382944. Its totient is φ = 9362700.

The previous prime is 9372791. The next prime is 9372823. The reversal of 9372821 is 1282739.

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 9372821 - 2¹⁴ = 9356437 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9372823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3515 + ... + 5576.

It is an arithmetic number, because the mean of its divisors is an integer number (2345736).

Almost surely, 2^9372821 is an apocalyptic number.

It is an amenable number.

9372821 is a deficient number, since it is larger than the sum of its proper divisors (10123).

9372821 is a wasteful number, since it uses less digits than its factorization.

9372821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122.

The product of its digits is 6048, while the sum is 32.

The square root of 9372821 is about 3061.5063285906. The cubic root of 9372821 is about 210.8418287060.

The spelling of 9372821 in words is "nine million, three hundred seventy-two thousand, eight hundred twenty-one".