8865421 has 2 divisors, whose sum is σ = 8865422. Its totient is φ = 8865420.

The previous prime is 8865413. The next prime is 8865427. The reversal of 8865421 is 1245688.

8865421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8820900 + 44521 = 2970^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 8865421 - 2³ = 8865413 is a prime.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8865427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4432710 + 4432711.

It is an arithmetic number, because the mean of its divisors is an integer number (4432711).

Almost surely, 2^8865421 is an apocalyptic number.

It is an amenable number.

8865421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8865421 is an equidigital number, since it uses as much as digits as its factorization.

8865421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15360, while the sum is 34.

The square root of 8865421 is about 2977.4856842645. The cubic root of 8865421 is about 206.9663725938.

The spelling of 8865421 in words is "eight million, eight hundred sixty-five thousand, four hundred twenty-one".