9428021 has 4 divisors (see below), whose sum is σ = 9439200. Its totient is φ = 9416844.

The previous prime is 9428017. The next prime is 9428033. The reversal of 9428021 is 1208249.

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 an emirpimes, since its reverse is a distinct semiprime: 1208249 = 7 ⋅172607.

It is a cyclic number.

It is not a de Polignac number, because 9428021 - 2² = 9428017 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 (9428071) 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, 4211 + ... + 6048.

It is an arithmetic number, because the mean of its divisors is an integer number (2359800).

Almost surely, 2^9428021 is an apocalyptic number.

It is an amenable number.

9428021 is a deficient number, since it is larger than the sum of its proper divisors (11179).

9428021 is a wasteful number, since it uses less digits than its factorization.

9428021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11178.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 9428021 is about 3070.5082641152. The cubic root of 9428021 is about 211.2549272336.

The spelling of 9428021 in words is "nine million, four hundred twenty-eight thousand, twenty-one".