8928421 has 2 divisors, whose sum is σ = 8928422. Its totient is φ = 8928420.

The previous prime is 8928419. The next prime is 8928431. The reversal of 8928421 is 1248298.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6320196 + 2608225 = 2514^2 + 1615^2 .

It is a cyclic number.

It is not a de Polignac number, because 8928421 - 2¹ = 8928419 is a prime.

Together with 8928419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8928431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4464210 + 4464211.

It is an arithmetic number, because the mean of its divisors is an integer number (4464211).

Almost surely, 2^8928421 is an apocalyptic number.

It is an amenable number.

8928421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8928421 is an equidigital number, since it uses as much as digits as its factorization.

8928421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 34.

The square root of 8928421 is about 2988.0463517154. The cubic root of 8928421 is about 207.4554682586.

The spelling of 8928421 in words is "eight million, nine hundred twenty-eight thousand, four hundred twenty-one".